diff options
-rw-r--r-- | openbsc/include/openbsc/osmo_msc_data.h | 7 | ||||
-rw-r--r-- | openbsc/src/osmo-bsc/osmo_bsc_api.c | 119 |
2 files changed, 122 insertions, 4 deletions
diff --git a/openbsc/include/openbsc/osmo_msc_data.h b/openbsc/include/openbsc/osmo_msc_data.h index 0bda66225..6eebcdd41 100644 --- a/openbsc/include/openbsc/osmo_msc_data.h +++ b/openbsc/include/openbsc/osmo_msc_data.h @@ -27,6 +27,8 @@ #include <osmocom/core/timer.h> +#include <regex.h> + struct osmo_bsc_rf; struct gsm_network; @@ -49,6 +51,11 @@ struct osmo_msc_data { int allow_emerg; int type; + /* local call routing */ + char *local_pref; + regex_t local_pref_reg; + + /* Connection data */ char *bsc_token; int ping_timeout; diff --git a/openbsc/src/osmo-bsc/osmo_bsc_api.c b/openbsc/src/osmo-bsc/osmo_bsc_api.c index 067ebabf5..132dcebc9 100644 --- a/openbsc/src/osmo-bsc/osmo_bsc_api.c +++ b/openbsc/src/osmo-bsc/osmo_bsc_api.c @@ -45,6 +45,10 @@ } \ bsc_queue_for_msc(conn->sccp_con, resp); +static int bsc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause); +static int complete_layer3(struct gsm_subscriber_connection *conn, + struct msgb *msg, struct osmo_msc_data *msc); + static uint16_t get_network_code_for_msc(struct osmo_msc_data *msc) { if (msc->core_ncc != -1) @@ -88,10 +92,7 @@ static void bsc_cipher_mode_compl(struct gsm_subscriber_connection *conn, static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg, uint16_t chosen_channel) { - struct msgb *resp; struct osmo_msc_data *msc; - uint16_t network_code; - uint16_t country_code; LOGP(DMSC, LOGL_INFO, "Tx MSC COMPL L3\n"); @@ -102,14 +103,25 @@ static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg return -1; } + return complete_layer3(conn, msg, msc); +} + +static int complete_layer3(struct gsm_subscriber_connection *conn, + struct msgb *msg, struct osmo_msc_data *msc) +{ + struct msgb *resp; + uint16_t network_code; + uint16_t country_code; + /* allocate resource for a new connection */ if (bsc_create_new_connection(conn, msc) != 0) return BSC_API_CONN_POL_REJECT; + bsc_scan_bts_msg(conn, msg); + network_code = get_network_code_for_msc(conn->sccp_con->msc); country_code = get_country_code_for_msc(conn->sccp_con->msc); - bsc_scan_bts_msg(conn, msg); resp = gsm0808_create_layer3(msg, network_code, country_code, conn->bts->location_area_code, conn->bts->cell_identity); @@ -130,6 +142,96 @@ static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg return BSC_API_CONN_POL_ACCEPT; } +/* + * Plastic surgery... we want to give up the current connection + */ +static int move_to_msc(struct gsm_subscriber_connection *_conn, + struct msgb *msg, struct osmo_msc_data *msc) +{ + struct osmo_bsc_sccp_con *old_con = _conn->sccp_con; + + /* + * 1. Give up the old connection. + * This happens by sending a clear request to the MSC, + * it should end with the MSC releasing the connection. + */ + old_con->conn = NULL; + bsc_clear_request(_conn, 0); + + /* + * 2. Attempt to create a new connection to the local + * MSC. If it fails the caller will need to handle this + * properly. + */ + _conn->sccp_con = NULL; + if (complete_layer3(_conn, msg, msc) != BSC_API_CONN_POL_ACCEPT) { + gsm0808_clear(_conn); + subscr_con_free(_conn); + return 1; + } + + return 2; +} + +static int handle_cc_setup(struct gsm_subscriber_connection *conn, + struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t pdisc = gh->proto_discr & 0x0f; + uint8_t mtype = gh->msg_type & 0xbf; + + struct osmo_msc_data *msc; + struct gsm_mncc_number called; + struct tlv_parsed tp; + unsigned payload_len; + + char _dest_nr[35]; + + /* + * Do we have a setup message here? if not return fast. + */ + if (pdisc != GSM48_PDISC_CC || mtype != GSM48_MT_CC_SETUP) + return 0; + + payload_len = msgb_l3len(msg) - sizeof(*gh); + + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + if (!TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) { + LOGP(DMSC, LOGL_ERROR, "Called BCD not present in setup.\n"); + return -1; + } + + memset(&called, 0, sizeof(called)); + gsm48_decode_called(&called, + TLVP_VAL(&tp, GSM48_IE_CALLED_BCD) - 1); + + if (called.plan != 1) + return 0; + + if (called.type == 1) { + _dest_nr[0] = _dest_nr[1] = '0'; + memcpy(_dest_nr + 2, called.number, sizeof(called.number)); + } else + memcpy(_dest_nr, called.number, sizeof(called.number)); + + /* + * Check if the connection should be moved... + */ + llist_for_each_entry(msc, &conn->bts->network->bsc_data->mscs, entry) { + if (msc->type != MSC_CON_TYPE_LOCAL) + continue; + if (!msc->local_pref) + continue; + if (regexec(&msc->local_pref_reg, _dest_nr, 0, NULL, 0) != 0) + continue; + + return move_to_msc(conn, msg, msc); + } + + return 0; +} + + static void bsc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg) { struct msgb *resp; @@ -137,7 +239,16 @@ static void bsc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, st LOGP(DMSC, LOGL_INFO, "Tx MSC DTAP LINK_ID=0x%02x\n", link_id); + /* + * We might want to move this connection to a new MSC. Ask someone + * to handle it. If it was handled we will return. + */ + if (handle_cc_setup(conn, msg) > 1) + return; + bsc_scan_bts_msg(conn, msg); + + resp = gsm0808_create_dtap(msg, link_id); queue_msg_or_return(resp); } |