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-rw-r--r--src/libbsc/bsc_api.c897
1 files changed, 0 insertions, 897 deletions
diff --git a/src/libbsc/bsc_api.c b/src/libbsc/bsc_api.c
deleted file mode 100644
index c60f8182a..000000000
--- a/src/libbsc/bsc_api.c
+++ /dev/null
@@ -1,897 +0,0 @@
-/* GSM 08.08 like API for OpenBSC. The bridge from MSC to BSC */
-
-/* (C) 2010-2011 by Holger Hans Peter Freyther
- * (C) 2010-2011 by On-Waves
- * (C) 2009 by Harald Welte <laforge@gnumonks.org>
- *
- * 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/bsc_api.h>
-#include <openbsc/bsc_rll.h>
-#include <openbsc/gsm_data.h>
-#include <openbsc/gsm_subscriber.h>
-#include <openbsc/signal.h>
-#include <openbsc/abis_rsl.h>
-#include <openbsc/chan_alloc.h>
-#include <openbsc/handover.h>
-#include <openbsc/debug.h>
-#include <openbsc/gsm_04_08.h>
-#include <openbsc/trau_mux.h>
-#include <openbsc/vlr.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
-
-
-static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind);
-static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id);
-static void handle_release(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan);
-static void handle_chan_ack(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan);
-static void handle_chan_nack(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan);
-
-/* GSM 08.08 3.2.2.33 */
-static uint8_t lchan_to_chosen_channel(struct gsm_lchan *lchan)
-{
- uint8_t channel_mode = 0, channel = 0;
-
- switch (lchan->tch_mode) {
- case GSM48_CMODE_SPEECH_V1:
- case GSM48_CMODE_SPEECH_EFR:
- case GSM48_CMODE_SPEECH_AMR:
- channel_mode = 0x9;
- break;
- case GSM48_CMODE_SIGN:
- channel_mode = 0x8;
- break;
- case GSM48_CMODE_DATA_14k5:
- channel_mode = 0xe;
- break;
- case GSM48_CMODE_DATA_12k0:
- channel_mode = 0xb;
- break;
- case GSM48_CMODE_DATA_6k0:
- channel_mode = 0xc;
- break;
- case GSM48_CMODE_DATA_3k6:
- channel_mode = 0xd;
- break;
- }
-
- switch (lchan->type) {
- case GSM_LCHAN_NONE:
- channel = 0x0;
- break;
- case GSM_LCHAN_SDCCH:
- channel = 0x1;
- break;
- case GSM_LCHAN_TCH_F:
- channel = 0x8;
- break;
- case GSM_LCHAN_TCH_H:
- channel = 0x9;
- break;
- case GSM_LCHAN_UNKNOWN:
- default:
- LOGP(DMSC, LOGL_ERROR, "Unknown lchan type: %p\n", lchan);
- break;
- }
-
- return channel_mode << 4 | channel;
-}
-
-static uint8_t chan_mode_to_speech(struct gsm_lchan *lchan)
-{
- int mode = 0;
-
- switch (lchan->tch_mode) {
- case GSM48_CMODE_SPEECH_V1:
- mode = 1;
- break;
- case GSM48_CMODE_SPEECH_EFR:
- mode = 0x11;
- break;
- case GSM48_CMODE_SPEECH_AMR:
- mode = 0x21;
- break;
- case GSM48_CMODE_SIGN:
- case GSM48_CMODE_DATA_14k5:
- case GSM48_CMODE_DATA_12k0:
- case GSM48_CMODE_DATA_6k0:
- case GSM48_CMODE_DATA_3k6:
- default:
- LOGP(DMSC, LOGL_ERROR, "Using non speech mode: %d\n", mode);
- return 0;
- break;
- }
-
- /* assume to always do AMR HR on any TCH type */
- if (lchan->type == GSM_LCHAN_TCH_H ||
- lchan->tch_mode == GSM48_CMODE_SPEECH_AMR)
- mode |= 0x4;
-
- return mode;
-}
-
-static void assignment_t10_timeout(void *_conn)
-{
- struct bsc_api *api;
- struct gsm_subscriber_connection *conn =
- (struct gsm_subscriber_connection *) _conn;
-
- LOGP(DMSC, LOGL_ERROR, "Assignment T10 timeout on %p\n", conn);
-
- /*
- * normal release on the secondary channel but only if the
- * secondary_channel has not been released by the handle_chan_nack.
- */
- if (conn->secondary_lchan)
- lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END);
- conn->secondary_lchan = NULL;
-
- /* inform them about the failure */
- api = conn->network->bsc_api;
- api->assign_fail(conn, GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL);
-}
-
-/*! \brief Determine and apply AMR multi-rate configuration to lchan
- * Determine which AMR multi-rate configuration to use and apply it to
- * the lchan (so it can be communicated to BTS and MS during channel
- * activation.
- * \param[in] conn subscriber connection (used to resolve bsc_api)
- * \param[out] lchan logical channel to which to apply mr config
- * \param[in] full_rate whether to use full-rate (1) or half-rate (0) config
- */
-static void handle_mr_config(struct gsm_subscriber_connection *conn,
- struct gsm_lchan *lchan, int full_rate)
-{
- struct bsc_api *api;
- api = conn->network->bsc_api;
- struct amr_multirate_conf *mr;
- struct gsm48_multi_rate_conf *mr_conf;
-
- /* BSC api override for this method, used in OsmoBSC mode with
- * bsc_mr_config() to use MSC-specific/specified configuration */
- if (api->mr_config)
- return api->mr_config(conn, lchan, full_rate);
-
- /* NITB case: use the BTS-specic multi-rate configuration from
- * the vty/configuration file */
- if (full_rate)
- mr = &lchan->ts->trx->bts->mr_full;
- else
- mr = &lchan->ts->trx->bts->mr_half;
-
- mr_conf = (struct gsm48_multi_rate_conf *) mr->gsm48_ie;
- mr_conf->ver = 1;
-
- /* default, if no AMR codec defined */
- if (!mr->gsm48_ie[1]) {
- mr_conf->icmi = 1;
- mr_conf->m5_90 = 1;
- }
- /* store encoded MR config IE lchan for both MS (uplink) and BTS
- * (downlink) directions */
- gsm48_multirate_config(lchan->mr_ms_lv, mr, mr->ms_mode);
- gsm48_multirate_config(lchan->mr_bts_lv, mr, mr->bts_mode);
-}
-
-/*
- * 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;
- int chan_type;
-
- chan_type = full_rate ? GSM_LCHAN_TCH_F : GSM_LCHAN_TCH_H;
-
- new_lchan = lchan_alloc(conn->bts, chan_type, 0);
-
- if (!new_lchan) {
- LOGP(DMSC, LOGL_NOTICE, "No free channel.\n");
- 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 = RSL_CMOD_SPD_SPEECH;
-
- /* handle AMR correctly */
- if (chan_mode == GSM48_CMODE_SPEECH_AMR)
- handle_mr_config(conn, new_lchan, full_rate);
-
- if (rsl_chan_activate_lchan(new_lchan, 0x1, 0) < 0) {
- LOGP(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;
-
- rsl_lchan_set_state(new_lchan, LCHAN_S_ACT_REQ);
- return 0;
-}
-
-struct gsm_subscriber_connection *bsc_subscr_con_allocate(struct gsm_lchan *lchan)
-{
- struct gsm_subscriber_connection *conn;
- struct gsm_network *net = lchan->ts->trx->bts->network;
-
- conn = talloc_zero(net, struct gsm_subscriber_connection);
- if (!conn)
- return NULL;
-
- conn->network = net;
- conn->lchan = lchan;
- conn->bts = lchan->ts->trx->bts;
- conn->via_ran = RAN_GERAN_A;
- conn->lac = conn->bts->location_area_code;
- lchan->conn = conn;
- llist_add_tail(&conn->entry, &net->subscr_conns);
- return conn;
-}
-
-void bsc_subscr_con_free(struct gsm_subscriber_connection *conn)
-{
- if (!conn)
- return;
-
- if (conn->network->bsc_api->conn_cleanup)
- conn->network->bsc_api->conn_cleanup(conn);
-
- if (conn->vsub) {
- LOGP(DNM, LOGL_ERROR, "conn->vsub should have been cleared.\n");
- conn->vsub = NULL;
- }
-
- if (conn->ho_lchan) {
- LOGP(DNM, LOGL_ERROR, "The ho_lchan should have been cleared.\n");
- conn->ho_lchan->conn = NULL;
- }
-
- if (conn->lchan) {
- LOGP(DNM, LOGL_ERROR, "The lchan should have been cleared.\n");
- conn->lchan->conn = NULL;
- }
-
- if (conn->secondary_lchan) {
- LOGP(DNM, LOGL_ERROR, "The secondary_lchan should have been cleared.\n");
- conn->secondary_lchan->conn = NULL;
- }
-
- llist_del(&conn->entry);
- talloc_free(conn);
-}
-
-int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
-{
- network->bsc_api = api;
- return 0;
-}
-
-/*! \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,
- "Called submit dtap without an lchan.\n");
- msgb_free(msg);
- return -1;
- }
-
- 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);
- send_sapi_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:
- /* signalling is always possible */
- return 1;
- 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 1;
- case GSM_LCHAN_TCH_H:
- if (full_rate)
- return 0;
- else
- return 1;
- break;
- default:
- return 0;
- }
- break;
- case GSM48_CMODE_DATA_12k0:
- case GSM48_CMODE_DATA_14k5:
- case GSM48_CMODE_SPEECH_EFR:
- /* these services all explicitly require a TCH/F */
- if (lchan->type == GSM_LCHAN_TCH_F)
- return 1;
- else
- return 0;
- break;
- }
-
- 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. It is assumed that
- * this is for audio handling only. In case the current channel does not allow
- * the selected mode a new one will be allocated.
- *
- * TODO: Add multirate configuration, make it work for more than audio.
- */
-int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate)
-{
- struct bsc_api *api;
- api = conn->network->bsc_api;
-
- if (!chan_compat_with_mode(conn->lchan, chan_mode, full_rate)) {
- if (handle_new_assignment(conn, chan_mode, full_rate) != 0)
- goto error;
- } else {
- if (chan_mode == GSM48_CMODE_SPEECH_AMR)
- handle_mr_config(conn, conn->lchan, full_rate);
-
- LOGP(DMSC, LOGL_NOTICE,
- "Sending %s ChanModify for speech: %s on channel %s\n",
- gsm_lchan_name(conn->lchan),
- get_value_string(gsm48_chan_mode_names, chan_mode),
- get_value_string(gsm_chan_t_names, conn->lchan->type));
- gsm48_lchan_modify(conn->lchan, chan_mode);
- }
-
- /* we will now start the timer to complete the assignment */
- osmo_timer_setup(&conn->T10, assignment_t10_timeout, conn);
- osmo_timer_schedule(&conn->T10, GSM0808_T10_VALUE);
- return 0;
-
-error:
- api->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;
- struct bsc_api *api = conn->network->bsc_api;
-
- if (conn->secondary_lchan != msg->lchan) {
- LOGP(DMSC, LOGL_ERROR, "Assignment Compl should occur on second lchan.\n");
- return;
- }
-
- gh = msgb_l3(msg);
- if (msgb_l3len(msg) - sizeof(*gh) != 1) {
- LOGP(DMSC, LOGL_ERROR, "Assignment Compl invalid: %zu\n",
- msgb_l3len(msg) - sizeof(*gh));
- return;
- }
-
- /* switch TRAU muxer for E1 based BTS from one channel to another */
- if (is_e1_bts(conn->bts))
- switch_trau_mux(conn->lchan, conn->secondary_lchan);
-
- /* swap channels */
- osmo_timer_del(&conn->T10);
-
- lchan_release(conn->lchan, 0, RSL_REL_LOCAL_END);
- conn->lchan = conn->secondary_lchan;
- conn->secondary_lchan = NULL;
-
- if (is_ipaccess_bts(conn->bts) && conn->lchan->tch_mode != GSM48_CMODE_SIGN)
- rsl_ipacc_crcx(conn->lchan);
-
- api->assign_compl(conn, gh->data[0],
- lchan_to_chosen_channel(conn->lchan),
- conn->lchan->encr.alg_id,
- chan_mode_to_speech(conn->lchan));
-}
-
-static void handle_ass_fail(struct gsm_subscriber_connection *conn,
- struct msgb *msg)
-{
- struct bsc_api *api = conn->network->bsc_api;
- uint8_t *rr_failure;
- struct gsm48_hdr *gh;
-
-
- if (conn->lchan != msg->lchan) {
- LOGP(DMSC, LOGL_ERROR, "Assignment failure should occur on primary lchan.\n");
- return;
- }
-
- /* stop the timer and release it */
- osmo_timer_del(&conn->T10);
- lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END);
- conn->secondary_lchan = NULL;
-
- gh = msgb_l3(msg);
- if (msgb_l3len(msg) - sizeof(*gh) != 1) {
- LOGP(DMSC, LOGL_ERROR, "assignment failure unhandled: %zu\n",
- msgb_l3len(msg) - sizeof(*gh));
- rr_failure = NULL;
- } else {
- rr_failure = &gh->data[0];
- }
-
- api->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 bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
- 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;
-
- DEBUGP(DRR, "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);
- }
- api->classmark_chg(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);
-
- DEBUGP(DRR, "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 */
-}
-
-/* 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);
-
- DEBUGP(DRR, "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 */
-}
-
-
-static void dispatch_dtap(struct gsm_subscriber_connection *conn,
- uint8_t link_id, struct msgb *msg)
-{
- struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
- struct gsm48_hdr *gh;
- uint8_t pdisc;
- uint8_t msg_type;
- int rc;
-
- if (msgb_l3len(msg) < sizeof(*gh)) {
- LOGP(DMSC, LOGL_ERROR, "Message too short for a GSM48 header.\n");
- 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:
- DEBUGP(DRR, "%s\n",
- gsm48_rr_msg_name(GSM48_MT_RR_GPRS_SUSP_REQ));
- break;
- case GSM48_MT_RR_STATUS:
- LOGP(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 */
- LOGP(DMEAS, LOGL_ERROR, "DIRECT GSM48 MEASUREMENT REPORT ?!? ");
- 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:
- if (api->cipher_mode_compl)
- api->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:
- osmo_timer_del(&conn->T10);
- rc = gsm48_rx_rr_modif_ack(msg);
- if (rc < 0) {
- api->assign_fail(conn,
- GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE,
- NULL);
- } else if (rc >= 0) {
- api->assign_compl(conn, 0,
- lchan_to_chosen_channel(conn->lchan),
- conn->lchan->encr.alg_id,
- chan_mode_to_speech(conn->lchan));
- }
- 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 */
- if (api->dtap)
- api->dtap(conn, link_id, msg);
- break;
- default:
- /* Normally, a MSC should never receive RR
- * messages, but we'd rather forward what we
- * don't know than drop it... */
- LOGP(DRR, LOGL_NOTICE,
- "BSC: Passing %s 04.08 RR message to MSC\n",
- gsm48_rr_msg_name(msg_type));
- if (api->dtap)
- api->dtap(conn, link_id, msg);
- }
- break;
- default:
- if (api->dtap)
- api->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 bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
- struct gsm_lchan *lchan;
-
- lchan = msg->lchan;
- if (lchan->state != LCHAN_S_ACTIVE) {
- LOGP(DRSL, LOGL_INFO, "Got data in non active state(%s), "
- "discarding.\n", gsm_lchans_name(lchan->state));
- 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);
- if (!lchan->conn) {
- lchan_release(lchan, 1, RSL_REL_NORMAL);
- return -1;
- }
-
- /* fwd via bsc_api to send COMPLETE L3 INFO to MSC */
- rc = api->compl_l3(lchan->conn, msg, 0);
-
- if (rc != BSC_API_CONN_POL_ACCEPT) {
- lchan->conn->lchan = NULL;
- bsc_subscr_con_free(lchan->conn);
- lchan_release(lchan, 1, RSL_REL_NORMAL);
- }
- }
-
- 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)
-{
- if (cipher > 0 && key == NULL) {
- LOGP(DRSL, LOGL_ERROR, "Need to have an encrytpion key.\n");
- return -1;
- }
-
- if (len > MAX_A5_KEY_LEN) {
- LOGP(DRSL, LOGL_ERROR, "The key is too long: %d\n", len);
- return -1;
- }
-
- conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(cipher);
- if (key) {
- conn->lchan->encr.key_len = len;
- memcpy(conn->lchan->encr.key, key, len);
- }
-
- 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_lchan)
- 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;
- conn->ho_lchan = NULL;
- conn->bts = NULL;
-
- osmo_timer_del(&conn->T10);
-
- return 0;
-}
-
-static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id)
-{
- struct bsc_api *api;
-
- if (!conn)
- return;
-
- api = conn->network->bsc_api;
- if (!api || !api->sapi_n_reject)
- return;
-
- api->sapi_n_reject(conn, link_id);
-}
-
-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:
- send_sapi_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 bsc_api *bsc;
- 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;
- bsc = lchan->ts->trx->bts->network->bsc_api;
- if (!bsc)
- return 0;
-
- switch (signal) {
- case S_LCHAN_UNEXPECTED_RELEASE:
- handle_release(lchan->conn, bsc, lchan);
- break;
- case S_LCHAN_ACTIVATE_ACK:
- handle_chan_ack(lchan->conn, bsc, lchan);
- break;
- case S_LCHAN_ACTIVATE_NACK:
- handle_chan_nack(lchan->conn, bsc, lchan);
- break;
- }
-
- return 0;
-}
-
-static void handle_release(struct gsm_subscriber_connection *conn,
- struct bsc_api *bsc, struct gsm_lchan *lchan)
-{
- int destruct = 1;
-
- if (conn->secondary_lchan == lchan) {
- osmo_timer_del(&conn->T10);
- conn->secondary_lchan = NULL;
-
- bsc->assign_fail(conn,
- GSM0808_CAUSE_RADIO_INTERFACE_FAILURE,
- NULL);
- }
-
- /* clear the connection now */
- if (bsc->clear_request)
- destruct = bsc->clear_request(conn, 0);
-
- /* now give up all channels */
- if (conn->lchan == lchan)
- conn->lchan = NULL;
- if (conn->ho_lchan == lchan) {
- bsc_clear_handover(conn, 0);
- conn->ho_lchan = NULL;
- }
- lchan->conn = NULL;
-
- gsm0808_clear(conn);
-
- if (destruct)
- bsc_subscr_con_free(conn);
-}
-
-static void handle_chan_ack(struct gsm_subscriber_connection *conn,
- struct bsc_api *api, struct gsm_lchan *lchan)
-{
- if (conn->secondary_lchan != lchan)
- return;
-
- LOGP(DMSC, LOGL_NOTICE, "Sending assignment on chan: %p\n", lchan);
- gsm48_send_rr_ass_cmd(conn->lchan, lchan, lchan->ms_power);
-}
-
-static void handle_chan_nack(struct gsm_subscriber_connection *conn,
- struct bsc_api *api, struct gsm_lchan *lchan)
-{
- if (conn->secondary_lchan != lchan)
- return;
-
- LOGP(DMSC, LOGL_ERROR, "Channel activation failed. Waiting for timeout now\n");
- conn->secondary_lchan->conn = NULL;
- conn->secondary_lchan = NULL;
-}
-
-static __attribute__((constructor)) void on_dso_load_bsc(void)
-{
- osmo_signal_register_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL);
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 21:04:14 +0000