diff options
Diffstat (limited to 'openbsc/src/libmsc')
| -rw-r--r-- | openbsc/src/libmsc/gsm_04_08.c | 217 |
1 files changed, 200 insertions, 17 deletions
diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c index e5402d0a6..84338d721 100644 --- a/openbsc/src/libmsc/gsm_04_08.c +++ b/openbsc/src/libmsc/gsm_04_08.c @@ -147,6 +147,15 @@ static int gsm48_conn_sendmsg(struct msgb *msg, struct gsm_subscriber_connection sign_link->trx->bts->nr, sign_link->trx->nr, msg->lchan->ts->nr, gh->proto_discr, gh->msg_type); + + if (conn->in_handover) { + msgb_enqueue(&conn->ho_queue, msg); + DEBUGP(DCC, "(bts %d trx %d ts %d) Suspend message sending to MS, " + "active HO procedure.\n", + sign_link->trx->bts->nr, + sign_link->trx->nr, msg->lchan->ts->nr); + return 0; + } } return gsm0808_submit_dtap(conn, msg, 0, 0); @@ -1749,11 +1758,8 @@ static int switch_for_handover(struct gsm_lchan *old_lchan, struct rtp_socket *old_rs, *new_rs, *other_rs; /* Ask the new socket to send to the already known port. */ - if (new_lchan->conn->mncc_rtp_bridge) { - LOGP(DHO, LOGL_DEBUG, "Forwarding RTP\n"); - rsl_ipacc_mdcx(new_lchan, - old_lchan->abis_ip.connect_ip, - old_lchan->abis_ip.connect_port, 0); + if (new_lchan->ts->trx->bts->network->mncc_state) { + /* Audio path should be switched after receiving ho detect message.*/ return 0; } @@ -1821,8 +1827,10 @@ static int handle_abisip_signal(unsigned int subsys, unsigned int signal, if (subsys != SS_ABISIP) return 0; + net = lchan->ts->trx->bts->network; + /* RTP bridge handling */ - if (lchan->conn && lchan->conn->mncc_rtp_bridge) + if (lchan->conn && net->mncc_state) return tch_rtp_signal(lchan, signal); /* in case we use direct BTS-to-BTS RTP */ @@ -1851,7 +1859,6 @@ static int handle_abisip_signal(unsigned int subsys, unsigned int signal, /* check if any transactions on this lchan still have * a tch_recv_mncc request pending */ - net = lchan->ts->trx->bts->network; llist_for_each_entry(trans, &net->trans_list, entry) { if (trans->conn && trans->conn->lchan == lchan && trans->tch_recv) { DEBUGP(DCC, "pending tch_recv_mncc request\n"); @@ -2017,6 +2024,13 @@ static int tch_recv_mncc(struct gsm_network *net, uint32_t callref, int enable) LOGP(DCC, LOGL_ERROR, "Error: RTP proxy is disabled\n"); return -EINVAL; } + /* RTP bridge handling */ + /* TODO: this is from fairwaves/master-rebase branch. It's not entirely clear which case + * this is catching and why. Find out and explain. */ + if (lchan->conn && net->mncc_state) { + LOGP(DCC, LOGL_NOTICE, "XXXXXXXXXX tch_recv_mncc(): if (lchan->conn && net->mncc_state) return 0\n"); + return 0; + } /* In case, we don't have a RTP socket to the BTS yet, the BTS * will not be connected to our RTP proxy and the socket will * not be assigned to the application interface. This method @@ -3325,6 +3339,41 @@ static void mncc_recv_rtp_err(struct gsm_network *net, uint32_t callref, int cmd return mncc_recv_rtp(net, callref, cmd, 0, 0, 0, 0); } +static void mncc_recv_rtp_modify(struct gsm_lchan *lchan, uint32_t callref) +{ + int msg_type; + struct gsm_network *net = lchan->ts->trx->bts->network; + + LOGP(DMNCC, LOGL_NOTICE, "%s sending pending RTP modify ind.\n", + gsm_lchan_name(lchan)); + + switch (lchan->abis_ip.rtp_payload) { + case RTP_PT_GSM_FULL: + msg_type = GSM_TCHF_FRAME; + break; + case RTP_PT_GSM_EFR: + msg_type = GSM_TCHF_FRAME_EFR; + break; + case RTP_PT_GSM_HALF: + msg_type = GSM_TCHH_FRAME; + break; + case RTP_PT_AMR: + msg_type = GSM_TCH_FRAME_AMR; + break; + default: + LOGP(DMNCC, LOGL_ERROR, "%s unknown payload type %d\n", + gsm_lchan_name(lchan), lchan->abis_ip.rtp_payload); + msg_type = 0; + break; + } + + mncc_recv_rtp(net, callref, MNCC_RTP_MODIFY, + lchan->abis_ip.bound_ip, + lchan->abis_ip.bound_port, + lchan->abis_ip.rtp_payload, + msg_type); +} + static int tch_rtp_create(struct gsm_network *net, uint32_t callref) { struct gsm_bts *bts; @@ -3374,6 +3423,9 @@ static int tch_rtp_create(struct gsm_network *net, uint32_t callref) LOGP(DMNCC, LOGL_DEBUG, "RTP create: codec=%s, chan_type=%s\n", get_value_string(gsm48_chan_mode_names, m), get_value_string(gsm_chan_t_names, lchan->type)); + if (trans->conn->in_handover) { + return 0; + } return gsm0808_assign_req(trans->conn, m, lchan->type != GSM_LCHAN_TCH_H); } @@ -3420,23 +3472,21 @@ static int tch_rtp_connect(struct gsm_network *net, void *arg) * same package! */ trans->conn->mncc_rtp_connect_pending = 1; + if (trans->conn->in_handover) { + lchan->abis_ip.connect_port = rtp->port; + lchan->abis_ip.connect_ip = rtp->ip; + return 0; + } return rsl_ipacc_mdcx(lchan, rtp->ip, rtp->port, 0); } static int tch_rtp_signal(struct gsm_lchan *lchan, int signal) { struct gsm_network *net; - struct gsm_trans *tmp, *trans = NULL; + struct gsm_trans *trans; net = lchan->ts->trx->bts->network; - llist_for_each_entry(tmp, &net->trans_list, entry) { - if (!tmp->conn) - continue; - if (tmp->conn->lchan != lchan && tmp->conn->ho_lchan != lchan) - continue; - trans = tmp; - break; - } + trans = trans_find_by_lchan(lchan); if (!trans) { LOGP(DMNCC, LOGL_ERROR, "%s IPA abis signal but no transaction.\n", @@ -3459,7 +3509,7 @@ static int tch_rtp_signal(struct gsm_lchan *lchan, int signal) maybe_switch_for_handover(lchan); break; case S_ABISIP_MDCX_ACK: - if (lchan->conn->mncc_rtp_connect_pending) { + if (lchan->conn->mncc_rtp_connect_pending && !lchan->conn->in_handover) { lchan->conn->mncc_rtp_connect_pending = 0; LOGP(DMNCC, LOGL_NOTICE, "%s sending pending RTP connect ind.\n", gsm_lchan_name(lchan)); @@ -3471,6 +3521,134 @@ static int tch_rtp_signal(struct gsm_lchan *lchan, int signal) return 0; } +static void ho_queue_clean(struct gsm_subscriber_connection *conn) +{ + struct msgb *msg; + while (!llist_empty(&conn->ho_queue)) { + msg = msgb_dequeue(&conn->ho_queue); + msgb_free(msg); + } +} + +static void ho_resumption(struct gsm_lchan *lchan, struct gsm_trans *trans) +{ + struct msgb *msg; + enum gsm48_chan_mode m; + + while (!llist_empty(&lchan->conn->ho_queue)) { + msg = msgb_dequeue(&lchan->conn->ho_queue); + gsm48_conn_sendmsg(msg, lchan->conn, trans); + } + + if (trans->conn->mncc_rtp_create_pending && + lchan->tch_mode == GSM48_CMODE_SIGN) { + m = mncc_codec_for_mode(lchan->type); + gsm0808_assign_req(lchan->conn, m, lchan->type != GSM_LCHAN_TCH_H); + } + + if (trans->conn->mncc_rtp_connect_pending) { + rsl_ipacc_mdcx(lchan, lchan->abis_ip.connect_ip, lchan->abis_ip.connect_port, 0); + } +} + +static int ho_complete(struct gsm_lchan *new_lchan) +{ + struct gsm_trans *trans; + + new_lchan->conn->in_handover = 0; + trans = trans_find_by_lchan(new_lchan); + if (!trans) { + LOGP(DHO, LOGL_ERROR, "%s HO detected, but no transaction for new_lchan.\n", + gsm_lchan_name(new_lchan)); + ho_queue_clean(new_lchan->conn); + return 0; + } + + ho_resumption(new_lchan, trans); + return 0; +} + +static int ho_fail(struct gsm_lchan *old_lchan) +{ + struct gsm_trans *trans; + + old_lchan->conn->in_handover = 0; + trans = trans_find_by_lchan(old_lchan); + if (trans) + ho_resumption(old_lchan, trans); + else { + LOGP(DHO, LOGL_ERROR, "%s HO fail, but no transaction for old_lchan.\n", + gsm_lchan_name(old_lchan)); + ho_queue_clean(old_lchan->conn); + } + + gsm0808_ho_clear(old_lchan->conn); + return 0; +} + +static int ho_detect(struct gsm_lchan *new_lchan) +{ + struct gsm_trans *trans; + struct gsm_lchan *old_lchan; + + trans = trans_find_by_lchan(new_lchan); + + if (!trans) { + LOGP(DHO, LOGL_ERROR, "%s HO detected, but no transaction for new_lchan" + " with enabled tch_recv.\n", + gsm_lchan_name(new_lchan)); + return 0; + } + + if (!new_lchan->conn->mncc_rtp_bridge) { + LOGP(DHO, LOGL_ERROR, "%s HO detected, but connection not in mncc_rtp_bridge mode.\n", + gsm_lchan_name(new_lchan)); + return 0; + } + + old_lchan = bsc_handover_pending(new_lchan); + if (!old_lchan) { + LOGP(DHO, LOGL_ERROR, "%s HO detected, but no old_lchan for handover.\n", + gsm_lchan_name(new_lchan)); + return 0; + } + + LOGP(DHO, LOGL_DEBUG, "HO detected, forwarding RTP\n"); + rsl_ipacc_mdcx(new_lchan, + old_lchan->abis_ip.connect_ip, + old_lchan->abis_ip.connect_port, 0); + + mncc_recv_rtp_modify(new_lchan, trans->callref); + + return 0; +} + +/* some other part of the code sends us a signal */ +static int handle_lchan_signal(unsigned int subsys, unsigned int signal, + void *handler_data, void *signal_data) +{ + struct lchan_signal_data *lchan_data; + struct gsm_lchan *lchan; + + lchan_data = signal_data; + switch (subsys) { + case SS_LCHAN: + lchan = lchan_data->lchan; + if (!lchan->conn) + return 0; + switch (signal) { + case S_LCHAN_HANDOVER_DETECT: + return ho_detect(lchan); + case S_LCHAN_HANDOVER_COMPL: + return ho_complete(lchan); + case S_LCHAN_HANDOVER_FAIL: + return ho_fail(lchan); + } + break; + } + + return 0; +} static struct downstate { uint32_t states; @@ -3853,6 +4031,11 @@ static int gsm0408_rcv_cc(struct gsm_subscriber_connection *conn, struct msgb *m gsm48_cc_msg_name(msg_type), trans?(trans->cc.state):0, gsm48_cc_state_name(trans?(trans->cc.state):0)); + if (conn->in_handover) { + DEBUGP(DCC, "Message unhandled, handover procedure.\n"); + return 0; + } + /* Create transaction */ if (!trans) { DEBUGP(DCC, "Unknown transaction ID %x, " |