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-rw-r--r--src/osmo-bsc/bsc_api.c676
1 files changed, 2 insertions, 674 deletions
diff --git a/src/osmo-bsc/bsc_api.c b/src/osmo-bsc/bsc_api.c
index 4cf11a466..e03093481 100644
--- a/src/osmo-bsc/bsc_api.c
+++ b/src/osmo-bsc/bsc_api.c
@@ -22,7 +22,6 @@
*/
#include <osmocom/bsc/bsc_api.h>
-#include <osmocom/bsc/bsc_rll.h>
#include <osmocom/bsc/gsm_data.h>
#include <osmocom/bsc/signal.h>
#include <osmocom/bsc/abis_rsl.h>
@@ -33,568 +32,20 @@
#include <osmocom/bsc/bsc_subscriber.h>
#include <osmocom/bsc/penalty_timers.h>
#include <osmocom/bsc/osmo_bsc_sigtran.h>
+#include <osmocom/bsc/lchan_fsm.h>
+#include <osmocom/bsc/bsc_subscr_conn_fsm.h>
#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/core/talloc.h>
-#define GSM0808_T10_VALUE 6, 0
-
-#define HO_DTAP_CACHE_MSGB_CB_LINK_ID 0
-#define HO_DTAP_CACHE_MSGB_CB_ALLOW_SACCH 1
-
-static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind);
-static void handle_release(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan);
-static void handle_chan_ack(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan);
-static void handle_chan_nack(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan);
-
-/*
- * Start a new assignment and make sure that it is completed within T10 either
- * positively, negatively or by the timeout.
- *
- * 1.) allocate a new lchan
- * 2.) copy the encryption key and other data from the
- * old to the new channel.
- * 3.) RSL Channel Activate this channel and wait
- *
- * -> Signal handler for the LCHAN
- * 4.) Send GSM 04.08 assignment command to the MS
- *
- * -> Assignment Complete/Assignment Failure
- * 5.) Release the SDCCH, continue signalling on the new link
- */
-static int handle_new_assignment(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate)
-{
- struct gsm_lchan *new_lchan;
- enum gsm_chan_t chan_type;
-
- chan_type = full_rate ? GSM_LCHAN_TCH_F : GSM_LCHAN_TCH_H;
-
- new_lchan = lchan_alloc(conn_get_bts(conn), chan_type, 0);
-
- if (!new_lchan) {
- LOGP(DMSC, LOGL_NOTICE, "%s No free channel for %s\n",
- bsc_subscr_name(conn->bsub), gsm_lchant_name(chan_type));
- return -1;
- }
-
- /* check if we are on TCH/F and requested TCH/H, but got TCH/F */
- if (conn->lchan->type == new_lchan->type
- && chan_type != new_lchan->type) {
- LOGPLCHAN(conn->lchan, DHO, LOGL_NOTICE,
- "-> %s Will not re-assign to identical channel type, %s was requested\n",
- gsm_lchan_name(new_lchan), gsm_lchant_name(chan_type));
- lchan_free(new_lchan);
- return -1;
- }
-
- /* copy old data to the new channel */
- memcpy(&new_lchan->encr, &conn->lchan->encr, sizeof(new_lchan->encr));
- new_lchan->ms_power = conn->lchan->ms_power;
- new_lchan->bs_power = conn->lchan->bs_power;
- new_lchan->rqd_ta = conn->lchan->rqd_ta;
-
- /* copy new data to it */
- new_lchan->tch_mode = chan_mode;
- new_lchan->rsl_cmode = (chan_mode == GSM48_CMODE_SIGN) ?
- RSL_CMOD_SPD_SIGN : RSL_CMOD_SPD_SPEECH;
-
- /* handle AMR correctly */
- if (chan_mode == GSM48_CMODE_SPEECH_AMR)
- bsc_mr_config(conn, new_lchan, full_rate);
-
- if (rsl_chan_activate_lchan(new_lchan, RSL_ACT_INTRA_NORM_ASS, 0) < 0) {
- LOGPLCHAN(new_lchan, DHO, LOGL_ERROR, "could not activate channel\n");
- lchan_free(new_lchan);
- return -1;
- }
-
- /* remember that we have the channel */
- conn->secondary_lchan = new_lchan;
- new_lchan->conn = conn;
- return 0;
-}
-
-static void ho_dtap_cache_add(struct gsm_subscriber_connection *conn, struct msgb *msg,
- int link_id, bool allow_sacch)
-{
- if (conn->ho_dtap_cache_len >= 23) {
- LOGP(DHO, LOGL_ERROR, "%s: Cannot cache more DTAP messages,"
- " already reached sane maximum of %u cached messages\n",
- bsc_subscr_name(conn->bsub), conn->ho_dtap_cache_len);
- msgb_free(msg);
- return;
- }
- conn->ho_dtap_cache_len ++;
- LOGP(DHO, LOGL_DEBUG, "%s: Caching DTAP message during ho/ass (%u)\n",
- bsc_subscr_name(conn->bsub), conn->ho_dtap_cache_len);
- msg->cb[HO_DTAP_CACHE_MSGB_CB_LINK_ID] = (unsigned long)link_id;
- msg->cb[HO_DTAP_CACHE_MSGB_CB_ALLOW_SACCH] = allow_sacch ? 1 : 0;
- msgb_enqueue(&conn->ho_dtap_cache, msg);
-}
-
-void ho_dtap_cache_flush(struct gsm_subscriber_connection *conn, int send)
-{
- struct msgb *msg;
- unsigned int flushed_count = 0;
-
- if (conn->secondary_lchan || conn->ho) {
- LOGP(DHO, LOGL_ERROR, "%s: Cannot send cached DTAP messages, handover/assignment is still ongoing\n",
- bsc_subscr_name(conn->bsub));
- send = 0;
- }
-
- while ((msg = msgb_dequeue(&conn->ho_dtap_cache))) {
- conn->ho_dtap_cache_len --;
- flushed_count ++;
- if (send) {
- int link_id = (int)msg->cb[HO_DTAP_CACHE_MSGB_CB_LINK_ID];
- bool allow_sacch = !!msg->cb[HO_DTAP_CACHE_MSGB_CB_ALLOW_SACCH];
- LOGP(DHO, LOGL_DEBUG, "%s: Sending cached DTAP message after handover/assignment (%u/%u)\n",
- bsc_subscr_name(conn->bsub), flushed_count, conn->ho_dtap_cache_len);
- gsm0808_submit_dtap(conn, msg, link_id, allow_sacch);
- } else
- msgb_free(msg);
- }
-}
-
-/*! \brief process incoming 08.08 DTAP from MSC (send via BTS to MS) */
-int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
- struct msgb *msg, int link_id, int allow_sacch)
-{
- uint8_t sapi;
-
-
- if (!conn->lchan) {
- LOGP(DMSC, LOGL_ERROR,
- "%s Called submit dtap without an lchan.\n",
- bsc_subscr_name(conn->bsub));
- msgb_free(msg);
- return -1;
- }
-
- /* buffer message during assignment / handover */
- if (conn->secondary_lchan || conn->ho) {
- ho_dtap_cache_add(conn, msg, link_id, !! allow_sacch);
- return 0;
- }
-
- sapi = link_id & 0x7;
- msg->lchan = conn->lchan;
- msg->dst = msg->lchan->ts->trx->rsl_link;
-
- /* If we are on a TCH and need to submit a SMS (on SAPI=3) we need to use the SACH */
- if (allow_sacch && sapi != 0) {
- if (conn->lchan->type == GSM_LCHAN_TCH_F || conn->lchan->type == GSM_LCHAN_TCH_H)
- link_id |= 0x40;
- }
-
- msg->l3h = msg->data;
- /* is requested SAPI already up? */
- if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
- /* Establish L2 for additional SAPI */
- OBSC_LINKID_CB(msg) = link_id;
- if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
- msgb_free(msg);
- bsc_sapi_n_reject(conn, link_id);
- return -1;
- }
- return 0;
- } else {
- /* Directly forward via RLL/RSL to BTS */
- return rsl_data_request(msg, link_id);
- }
-}
-
-/*
- * \brief Check if the given channel is compatible with the mode/fullrate
- */
-static int chan_compat_with_mode(struct gsm_lchan *lchan, int chan_mode, int full_rate)
-{
- switch (chan_mode) {
- case GSM48_CMODE_SIGN:
- switch (lchan->type) {
- case GSM_LCHAN_TCH_F:
- case GSM_LCHAN_TCH_H:
- case GSM_LCHAN_SDCCH:
- return 1;
- default:
- return 0;
- }
- case GSM48_CMODE_SPEECH_V1:
- case GSM48_CMODE_SPEECH_AMR:
- case GSM48_CMODE_DATA_3k6:
- case GSM48_CMODE_DATA_6k0:
- /* these services can all run on TCH/H, but we may have
- * an explicit override by the 'full_rate' argument */
- switch (lchan->type) {
- case GSM_LCHAN_TCH_F:
- return full_rate ? 1 : 0;
- case GSM_LCHAN_TCH_H:
- return full_rate ? 0 : 1;
- default:
- return 0;
- }
- case GSM48_CMODE_DATA_12k0:
- case GSM48_CMODE_DATA_14k5:
- case GSM48_CMODE_SPEECH_EFR:
- /* these services all explicitly require a TCH/F */
- return (lchan->type == GSM_LCHAN_TCH_F) ? 1 : 0;
- default:
- return 0;
- }
-}
-
-/*! Send a GSM08.08 Assignment Request. Right now this does not contain the
- * audio codec type or the allowed rates for the config. In case the current
- * channel does not allow the selected mode a new one will be allocated.
- * \param[out] conn related subscriber connection
- * \param[in] chan_mode mode of the channel (see enum gsm48_chan_mode)
- * \param[in] full_rate select full rate or half rate channel
- * \returns 0 on success, 1 when no operation is neccessary, -1 on failure */
-int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate)
-{
- /* TODO: Add multirate configuration, make it work for more than audio. */
-
- if (!chan_compat_with_mode(conn->lchan, chan_mode, full_rate)) {
- if (handle_new_assignment(conn, chan_mode, full_rate) != 0)
- goto error;
- } else {
- /* Check if the channel is already in the requested mode, if
- * yes, we skip unnecessary channel mode modify operations. */
- if (conn->lchan->tch_mode == chan_mode)
- return 1;
-
- if (chan_mode == GSM48_CMODE_SPEECH_AMR)
- bsc_mr_config(conn, conn->lchan, full_rate);
-
- LOGPLCHAN(conn->lchan, DMSC, LOGL_NOTICE,
- "Sending ChanModify for speech: %s\n",
- get_value_string(gsm48_chan_mode_names, chan_mode));
- gsm48_lchan_modify(conn->lchan, chan_mode);
- }
-
- /* we expect the caller will manage T10 */
- return 0;
-
-error:
- bsc_assign_fail(conn, 0, NULL);
- return -1;
-}
-
int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len,
uint8_t *mi, int chan_type)
{
return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type, false);
}
-static void handle_ass_compl(struct gsm_subscriber_connection *conn,
- struct msgb *msg)
-{
- struct gsm48_hdr *gh = msgb_l3(msg);
- enum gsm48_rr_cause cause;
-
- /* Expecting gsm48_hdr + cause value */
- if (msgb_l3len(msg) != sizeof(*gh) + 1) {
- LOGPLCHAN(msg->lchan, DRR, LOGL_ERROR,
- "RR Assignment Complete: length invalid: %u, expected %zu\n",
- msgb_l3len(msg), sizeof(*gh) + 1);
- return;
- }
-
- cause = gh->data[0];
-
- LOGPLCHAN(msg->lchan, DRR, LOGL_DEBUG, "ASSIGNMENT COMPLETE cause = %s\n",
- rr_cause_name(cause));
-
- if (conn->ho) {
- struct lchan_signal_data sig = {
- .lchan = msg->lchan,
- };
- osmo_signal_dispatch(SS_LCHAN, S_LCHAN_ASSIGNMENT_COMPL, &sig);
- /* FIXME: release old channel */
-
- /* send pending messages, if any */
- ho_dtap_cache_flush(conn, 1);
-
- return;
- }
-
- if (conn->secondary_lchan != msg->lchan) {
- LOGPLCHAN(msg->lchan, DRR, LOGL_ERROR,
- "RR Assignment Complete does not match conn's secondary lchan.\n");
- return;
- }
-
- lchan_release(conn->lchan, 0, RSL_REL_LOCAL_END);
- conn->lchan = conn->secondary_lchan;
- conn->secondary_lchan = NULL;
-
- /* send pending messages, if any */
- ho_dtap_cache_flush(conn, 1);
-
- if (is_ipaccess_bts(conn_get_bts(conn)) && conn->lchan->tch_mode != GSM48_CMODE_SIGN)
- rsl_ipacc_crcx(conn->lchan);
-
- bsc_assign_compl(conn, cause);
-}
-
-static void handle_ass_fail(struct gsm_subscriber_connection *conn,
- struct msgb *msg)
-{
- uint8_t *rr_failure;
- struct gsm48_hdr *gh;
-
- if (conn->ho) {
- struct lchan_signal_data sig;
- struct gsm48_hdr *gh = msgb_l3(msg);
-
- LOGPLCHAN(msg->lchan, DRR, LOGL_DEBUG, "ASSIGNMENT FAILED cause = %s\n",
- rr_cause_name(gh->data[0]));
-
- sig.lchan = msg->lchan;
- sig.mr = NULL;
- osmo_signal_dispatch(SS_LCHAN, S_LCHAN_ASSIGNMENT_FAIL, &sig);
- /* FIXME: release allocated new channel */
-
- /* send pending messages, if any */
- ho_dtap_cache_flush(conn, 1);
-
- return;
- }
-
- if (conn->lchan != msg->lchan) {
- LOGPLCHAN(msg->lchan, DMSC, LOGL_ERROR,
- "Assignment failure should occur on primary lchan.\n");
- return;
- }
-
- /* stop the timer and release it */
- if (conn->secondary_lchan) {
- lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END);
- conn->secondary_lchan = NULL;
- }
-
- /* send pending messages, if any */
- ho_dtap_cache_flush(conn, 1);
-
- gh = msgb_l3(msg);
- if (msgb_l3len(msg) - sizeof(*gh) != 1) {
- LOGPLCHAN(conn->lchan, DMSC, LOGL_ERROR, "assignment failure unhandled: %zu\n",
- msgb_l3len(msg) - sizeof(*gh));
- rr_failure = NULL;
- } else {
- rr_failure = &gh->data[0];
- }
-
- bsc_assign_fail(conn, GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE, rr_failure);
-}
-
-static void handle_classmark_chg(struct gsm_subscriber_connection *conn,
- struct msgb *msg)
-{
- struct gsm48_hdr *gh = msgb_l3(msg);
- unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
- uint8_t cm2_len, cm3_len = 0;
- uint8_t *cm2, *cm3 = NULL;
-
- LOGPLCHAN(msg->lchan, DRR, LOGL_DEBUG, "CLASSMARK CHANGE ");
-
- /* classmark 2 */
- cm2_len = gh->data[0];
- cm2 = &gh->data[1];
- DEBUGPC(DRR, "CM2(len=%u) ", cm2_len);
-
- if (payload_len > cm2_len + 1) {
- /* we must have a classmark3 */
- if (gh->data[cm2_len+1] != 0x20) {
- DEBUGPC(DRR, "ERR CM3 TAG\n");
- return;
- }
- if (cm2_len > 3) {
- DEBUGPC(DRR, "CM2 too long!\n");
- return;
- }
-
- cm3_len = gh->data[cm2_len+2];
- cm3 = &gh->data[cm2_len+3];
- if (cm3_len > 14) {
- DEBUGPC(DRR, "CM3 len %u too long!\n", cm3_len);
- return;
- }
- DEBUGPC(DRR, "CM3(len=%u)\n", cm3_len);
- }
- bsc_cm_update(conn, cm2, cm2_len, cm3, cm3_len);
-}
-
-/* Chapter 9.1.16 Handover complete */
-static void handle_rr_ho_compl(struct msgb *msg)
-{
- struct lchan_signal_data sig;
- struct gsm48_hdr *gh = msgb_l3(msg);
-
- LOGPLCHAN(msg->lchan, DRR, LOGL_DEBUG,
- "HANDOVER COMPLETE cause = %s\n", rr_cause_name(gh->data[0]));
-
- sig.lchan = msg->lchan;
- sig.mr = NULL;
- osmo_signal_dispatch(SS_LCHAN, S_LCHAN_HANDOVER_COMPL, &sig);
- /* FIXME: release old channel */
-
- /* send pending messages, if any */
- ho_dtap_cache_flush(msg->lchan->conn, 1);
-}
-
-/* Chapter 9.1.17 Handover Failure */
-static void handle_rr_ho_fail(struct msgb *msg)
-{
- struct lchan_signal_data sig;
- struct gsm48_hdr *gh = msgb_l3(msg);
-
- /* Log on both RR and HO categories: it is an RR message, but is still quite important when
- * filtering on HO. */
- LOGPLCHAN(msg->lchan, DRR, LOGL_DEBUG,
- "HANDOVER FAILED cause = %s\n", rr_cause_name(gh->data[0]));
- LOGPLCHAN(msg->lchan, DHO, LOGL_DEBUG,
- "HANDOVER FAILED cause = %s\n", rr_cause_name(gh->data[0]));
-
- sig.lchan = msg->lchan;
- sig.mr = NULL;
- osmo_signal_dispatch(SS_LCHAN, S_LCHAN_HANDOVER_FAIL, &sig);
- /* FIXME: release allocated new channel */
-
- /* send pending messages, if any */
- ho_dtap_cache_flush(msg->lchan->conn, 1);
-}
-
-
-static void dispatch_dtap(struct gsm_subscriber_connection *conn,
- uint8_t link_id, struct msgb *msg)
-{
- struct gsm48_hdr *gh;
- uint8_t pdisc;
- uint8_t msg_type;
- int rc;
-
- if (msgb_l3len(msg) < sizeof(*gh)) {
- LOGP(DMSC, LOGL_ERROR, "(%s) Message too short for a GSM48 header.\n",
- bsc_subscr_name(conn->bsub));
- return;
- }
-
- gh = msgb_l3(msg);
- pdisc = gsm48_hdr_pdisc(gh);
- msg_type = gsm48_hdr_msg_type(gh);
-
- /* the idea is to handle all RR messages here, and only hand
- * MM/CC/SMS-CP/LCS up to the MSC. Some messages like PAGING
- * RESPONSE or CM SERVICE REQUEST will not be covered here, as
- * they are only possible in the first L3 message of each L2
- * channel, i.e. 'conn' will not exist and gsm0408_rcvmsg()
- * will call api->compl_l3() for it */
- switch (pdisc) {
- case GSM48_PDISC_RR:
- switch (msg_type) {
- case GSM48_MT_RR_GPRS_SUSP_REQ:
- LOGPLCHAN(msg->lchan, DRR, LOGL_DEBUG,
- "%s\n", gsm48_rr_msg_name(GSM48_MT_RR_GPRS_SUSP_REQ));
- break;
- case GSM48_MT_RR_STATUS:
- LOGPLCHAN(msg->lchan, DRR, LOGL_NOTICE,
- "%s (cause: %s)\n", gsm48_rr_msg_name(GSM48_MT_RR_STATUS),
- rr_cause_name(gh->data[0]));
- break;
- case GSM48_MT_RR_MEAS_REP:
- /* This shouldn't actually end up here, as RSL treats
- * L3 Info of 08.58 MEASUREMENT REPORT different by calling
- * directly into gsm48_parse_meas_rep */
- LOGPLCHAN(msg->lchan, DMEAS, LOGL_ERROR,
- "DIRECT GSM48 MEASUREMENT REPORT ?!?\n");
- gsm48_tx_rr_status(conn, GSM48_RR_CAUSE_MSG_TYPE_N_COMPAT);
- break;
- case GSM48_MT_RR_HANDO_COMPL:
- handle_rr_ho_compl(msg);
- break;
- case GSM48_MT_RR_HANDO_FAIL:
- handle_rr_ho_fail(msg);
- break;
- case GSM48_MT_RR_CIPH_M_COMPL:
- bsc_cipher_mode_compl(conn, msg, conn->lchan->encr.alg_id);
- break;
- case GSM48_MT_RR_ASS_COMPL:
- handle_ass_compl(conn, msg);
- break;
- case GSM48_MT_RR_ASS_FAIL:
- handle_ass_fail(conn, msg);
- break;
- case GSM48_MT_RR_CHAN_MODE_MODIF_ACK:
- rc = gsm48_rx_rr_modif_ack(msg);
- if (rc < 0)
- bsc_assign_fail(conn, GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL);
- else
- bsc_assign_compl(conn, 0);
- break;
- case GSM48_MT_RR_CLSM_CHG:
- handle_classmark_chg(conn, msg);
- break;
- case GSM48_MT_RR_APP_INFO:
- /* Passing RR APP INFO to MSC, not quite
- * according to spec */
- bsc_dtap(conn, link_id, msg);
- break;
- default:
- /* Drop unknown RR message */
- LOGPLCHAN(msg->lchan, DRR, LOGL_NOTICE,
- "Dropping %s 04.08 RR message\n", gsm48_rr_msg_name(msg_type));
- gsm48_tx_rr_status(conn, GSM48_RR_CAUSE_MSG_TYPE_N);
- break;
- }
- break;
- default:
- bsc_dtap(conn, link_id, msg);
- break;
- }
-}
-
-/*! \brief RSL has received a DATA INDICATION with L3 from MS */
-int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
-{
- int rc;
- struct gsm_lchan *lchan;
-
- lchan = msg->lchan;
- if (lchan->state != LCHAN_S_ACTIVE) {
- LOGPLCHAN(msg->lchan, DRSL, LOGL_INFO, "Got data in non active state, discarding.\n");
- return -1;
- }
-
-
- if (lchan->conn) {
- /* if we already have a connection, forward via DTAP to
- * MSC */
- dispatch_dtap(lchan->conn, link_id, msg);
- } else {
- /* allocate a new connection */
- rc = BSC_API_CONN_POL_REJECT;
- lchan->conn = bsc_subscr_con_allocate(msg->lchan->ts->trx->bts->network);
- if (!lchan->conn) {
- lchan_release(lchan, 1, RSL_REL_NORMAL);
- return -1;
- }
- lchan->conn->lchan = lchan;
-
- /* fwd via bsc_api to send COMPLETE L3 INFO to MSC */
- rc = bsc_compl_l3(lchan->conn, msg, 0);
-
- if (rc != BSC_API_CONN_POL_ACCEPT) {
- //osmo_fsm_inst_dispatch(lchan->conn->fi, FIXME, NULL);
- }
- }
-
- return 0;
-}
-
/*! \brief We received a GSM 08.08 CIPHER MODE from the MSC */
int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
const uint8_t *key, int len, int include_imeisv)
@@ -622,126 +73,3 @@ int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
return gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv);
}
-
-/*
- * Release all occupied RF Channels but stay around for more.
- */
-int gsm0808_clear(struct gsm_subscriber_connection *conn)
-{
- if (conn->ho)
- bsc_clear_handover(conn, 1);
-
- if (conn->secondary_lchan)
- lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END);
-
- if (conn->lchan)
- lchan_release(conn->lchan, 1, RSL_REL_NORMAL);
-
- conn->lchan = NULL;
- conn->secondary_lchan = NULL;
-
- return 0;
-}
-
-static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind)
-{
- struct msgb *msg = _data;
-
- /*
- * There seems to be a small window that the RLL timer can
- * fire after a lchan_release call and before the S_CHALLOC_FREED
- * is called. Check if a conn is set before proceeding.
- */
- if (!lchan->conn)
- return;
-
- switch (rllr_ind) {
- case BSC_RLLR_IND_EST_CONF:
- rsl_data_request(msg, OBSC_LINKID_CB(msg));
- break;
- case BSC_RLLR_IND_REL_IND:
- case BSC_RLLR_IND_ERR_IND:
- case BSC_RLLR_IND_TIMEOUT:
- bsc_sapi_n_reject(lchan->conn, OBSC_LINKID_CB(msg));
- msgb_free(msg);
- break;
- }
-}
-
-static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
- void *handler_data, void *signal_data)
-{
- struct gsm_lchan *lchan;
- struct lchan_signal_data *lchan_data;
-
- if (subsys != SS_LCHAN)
- return 0;
-
-
- lchan_data = signal_data;
- if (!lchan_data->lchan || !lchan_data->lchan->conn)
- return 0;
-
- lchan = lchan_data->lchan;
-
- switch (signal) {
- case S_LCHAN_UNEXPECTED_RELEASE:
- LOGPLCHAN(lchan, DMSC, LOGL_NOTICE, "S_LCHAN_UNEXPECTED_RELEASE\n");
- handle_release(lchan->conn, lchan);
- break;
- case S_LCHAN_ACTIVATE_ACK:
- handle_chan_ack(lchan->conn, lchan);
- break;
- case S_LCHAN_ACTIVATE_NACK:
- handle_chan_nack(lchan->conn, lchan);
- break;
- }
-
- return 0;
-}
-
-static void handle_release(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan)
-{
- if (conn->secondary_lchan == lchan) {
- LOGPLCHAN(lchan, DMSC, LOGL_NOTICE,
- "lchan release on new lchan, Assignment failed\n");
- conn->secondary_lchan = NULL;
-
- bsc_assign_fail(conn, GSM0808_CAUSE_RADIO_INTERFACE_FAILURE, NULL);
- }
-
- /* clear the connection now */
- bsc_clear_request(conn, 0);
-
- /* now give up all channels */
- if (conn->lchan == lchan)
- conn->lchan = NULL;
- if (conn->ho && conn->ho->new_lchan == lchan)
- bsc_clear_handover(conn, 0);
- lchan->conn = NULL;
-}
-
-static void handle_chan_ack(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan)
-{
- if (conn->secondary_lchan != lchan)
- return;
-
- LOGPLCHAN(lchan, DMSC, LOGL_NOTICE, "Sending RR Assignment\n");
- gsm48_send_rr_ass_cmd(conn->lchan, lchan, lchan->ms_power);
-}
-
-static void handle_chan_nack(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan)
-{
- if (conn->secondary_lchan != lchan)
- return;
-
- LOGPLCHAN(lchan, DMSC, LOGL_ERROR, "Channel activation failed.\n");
- conn->secondary_lchan->conn = NULL;
- conn->secondary_lchan = NULL;
- bsc_assign_fail(conn, GSM0808_CAUSE_RADIO_INTERFACE_FAILURE, NULL);
-}
-
-static __attribute__((constructor)) void on_dso_load_bsc(void)
-{
- osmo_signal_register_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL);
-}