diff options
Diffstat (limited to 'src/osmo-bsc/osmo_bsc_filter.c')
| -rw-r--r-- | src/osmo-bsc/osmo_bsc_filter.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/src/osmo-bsc/osmo_bsc_filter.c b/src/osmo-bsc/osmo_bsc_filter.c index 773a14699..332ba6b83 100644 --- a/src/osmo-bsc/osmo_bsc_filter.c +++ b/src/osmo-bsc/osmo_bsc_filter.c @@ -30,203 +30,6 @@ #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; - - if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*lu)) { - LOGP(DMSC, LOGL_ERROR, "LU too small to look at: %u\n", msgb_l3len(msg)); - return; - } - - gh = msgb_l3(msg); - lu = (struct gsm48_loc_upd_req *) gh->data; - - gsm48_generate_lai2(&lai, bts_lai(conn_get_bts(conn))); - - if (memcmp(&lai, &lu->lai, sizeof(lai)) != 0) { - LOGP(DMSC, LOGL_DEBUG, "Marking con for welcome USSD.\n"); - conn->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_get_bts(conn), 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->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->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_msc(conn_get_bts(conn), 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) { if (!conn->sccp.msc->ussd_welcome_txt) { @@ -237,14 +40,6 @@ static int send_welcome_ussd(struct gsm_subscriber_connection *conn) return BSS_SEND_USSD; } -int bsc_send_welcome_ussd(struct gsm_subscriber_connection *conn) -{ - bsc_send_ussd_notify(conn, 1, conn->sccp.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) { |