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authorJonathan Santos <jrsantos@jonathanrsantos.com>2011-05-25 13:54:02 -0400
committerJonathan Santos <jrsantos@jonathanrsantos.com>2011-05-25 13:54:02 -0400
commit03fd8d014f9871896a86534432c8757d65a576fe (patch)
treebad087cacfb6b106f6ca542bf92ef2e2ecea5dd3 /src/libbsc/gsm_04_08_utils.c
parente7dae79f5839029279c9fd4543804882c019bf42 (diff)
Import upstream version 0.9.13upstream/0.9.13
Diffstat (limited to 'src/libbsc/gsm_04_08_utils.c')
-rw-r--r--src/libbsc/gsm_04_08_utils.c655
1 files changed, 655 insertions, 0 deletions
diff --git a/src/libbsc/gsm_04_08_utils.c b/src/libbsc/gsm_04_08_utils.c
new file mode 100644
index 00000000..6d12cc08
--- /dev/null
+++ b/src/libbsc/gsm_04_08_utils.c
@@ -0,0 +1,655 @@
+/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
+ * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0
+ * utility functions
+ */
+
+/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.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 <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <netinet/in.h>
+
+#include <osmocore/msgb.h>
+#include <osmocore/gsm48.h>
+
+#include <openbsc/abis_rsl.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_04_08.h>
+#include <openbsc/transaction.h>
+#include <openbsc/paging.h>
+#include <openbsc/signal.h>
+
+/* should ip.access BTS use direct RTP streams between each other (1),
+ * or should OpenBSC always act as RTP relay/proxy in between (0) ? */
+int ipacc_rtp_direct = 1;
+
+static int gsm48_sendmsg(struct msgb *msg)
+{
+ if (msg->lchan)
+ msg->trx = msg->lchan->ts->trx;
+
+ msg->l3h = msg->data;
+ return rsl_data_request(msg, 0);
+}
+
+/* Section 9.1.8 / Table 9.9 */
+struct chreq {
+ u_int8_t val;
+ u_int8_t mask;
+ enum chreq_type type;
+};
+
+/* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */
+static const struct chreq chreq_type_neci1[] = {
+ { 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
+ { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F },
+ { 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H },
+ { 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL },
+ { 0xe0, 0xe0, CHREQ_T_TCH_F },
+ { 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H },
+ { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
+ { 0x00, 0xf0, CHREQ_T_LOCATION_UPD },
+ { 0x10, 0xf0, CHREQ_T_SDCCH },
+ { 0x80, 0xe0, CHREQ_T_PAG_R_ANY_NECI1 },
+ { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
+ { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
+ { 0x67, 0xff, CHREQ_T_LMU },
+ { 0x60, 0xf9, CHREQ_T_RESERVED_SDCCH },
+ { 0x61, 0xfb, CHREQ_T_RESERVED_SDCCH },
+ { 0x63, 0xff, CHREQ_T_RESERVED_SDCCH },
+ { 0x7f, 0xff, CHREQ_T_RESERVED_IGNORE },
+};
+
+/* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */
+static const struct chreq chreq_type_neci0[] = {
+ { 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
+ { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H },
+ { 0xe0, 0xe0, CHREQ_T_TCH_F },
+ { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
+ { 0x00, 0xe0, CHREQ_T_LOCATION_UPD },
+ { 0x80, 0xe0, CHREQ_T_PAG_R_ANY_NECI0 },
+ { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
+ { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
+ { 0x67, 0xff, CHREQ_T_LMU },
+ { 0x60, 0xf9, CHREQ_T_RESERVED_SDCCH },
+ { 0x61, 0xfb, CHREQ_T_RESERVED_SDCCH },
+ { 0x63, 0xff, CHREQ_T_RESERVED_SDCCH },
+ { 0x7f, 0xff, CHREQ_T_RESERVED_IGNORE },
+};
+
+static const enum gsm_chan_t ctype_by_chreq[] = {
+ [CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_PAG_R_ANY_NECI1] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_PAG_R_ANY_NECI0] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_LMU] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_RESERVED_SDCCH] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_RESERVED_IGNORE] = GSM_LCHAN_UNKNOWN,
+};
+
+static const enum gsm_chreq_reason_t reason_by_chreq[] = {
+ [CHREQ_T_EMERG_CALL] = GSM_CHREQ_REASON_EMERG,
+ [CHREQ_T_CALL_REEST_TCH_F] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_CALL_REEST_TCH_H] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_SDCCH] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_TCH_F] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_VOICE_CALL_TCH_H] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_DATA_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_LOCATION_UPD] = GSM_CHREQ_REASON_LOCATION_UPD,
+ [CHREQ_T_PAG_R_ANY_NECI1] = GSM_CHREQ_REASON_PAG,
+ [CHREQ_T_PAG_R_ANY_NECI0] = GSM_CHREQ_REASON_PAG,
+ [CHREQ_T_PAG_R_TCH_F] = GSM_CHREQ_REASON_PAG,
+ [CHREQ_T_PAG_R_TCH_FH] = GSM_CHREQ_REASON_PAG,
+ [CHREQ_T_LMU] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_RESERVED_SDCCH] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_RESERVED_IGNORE] = GSM_CHREQ_REASON_OTHER,
+};
+
+/* verify that the two tables match */
+static_assert(sizeof(ctype_by_chreq) ==
+ sizeof(((struct gsm_network *) NULL)->ctype_by_chreq), assert_size);
+
+/*
+ * Update channel types for request based on policy. E.g. in the
+ * case of a TCH/H network/bsc use TCH/H for the emergency calls,
+ * for early assignment assign a SDCCH and some other options.
+ */
+void gsm_net_update_ctype(struct gsm_network *network)
+{
+ /* copy over the data */
+ memcpy(network->ctype_by_chreq, ctype_by_chreq, sizeof(ctype_by_chreq));
+
+ /*
+ * Use TCH/H for emergency calls when this cell allows TCH/H. Maybe it
+ * is better to iterate over the BTS/TRX and check if no TCH/F is available
+ * and then set it to TCH/H.
+ */
+ if (network->neci)
+ network->ctype_by_chreq[CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_H;
+
+ if (network->pag_any_tch) {
+ if (network->neci) {
+ network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI0] = GSM_LCHAN_TCH_H;
+ network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI1] = GSM_LCHAN_TCH_H;
+ } else {
+ network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI0] = GSM_LCHAN_TCH_F;
+ network->ctype_by_chreq[CHREQ_T_PAG_R_ANY_NECI1] = GSM_LCHAN_TCH_F;
+ }
+ }
+}
+
+enum gsm_chan_t get_ctype_by_chreq(struct gsm_network *network, u_int8_t ra)
+{
+ int i;
+ int length;
+ const struct chreq *chreq;
+
+ if (network->neci) {
+ chreq = chreq_type_neci1;
+ length = ARRAY_SIZE(chreq_type_neci1);
+ } else {
+ chreq = chreq_type_neci0;
+ length = ARRAY_SIZE(chreq_type_neci0);
+ }
+
+
+ for (i = 0; i < length; i++) {
+ const struct chreq *chr = &chreq[i];
+ if ((ra & chr->mask) == chr->val)
+ return network->ctype_by_chreq[chr->type];
+ }
+ LOGP(DRR, LOGL_ERROR, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra);
+ return GSM_LCHAN_SDCCH;
+}
+
+enum gsm_chreq_reason_t get_reason_by_chreq(u_int8_t ra, int neci)
+{
+ int i;
+ int length;
+ const struct chreq *chreq;
+
+ if (neci) {
+ chreq = chreq_type_neci1;
+ length = ARRAY_SIZE(chreq_type_neci1);
+ } else {
+ chreq = chreq_type_neci0;
+ length = ARRAY_SIZE(chreq_type_neci0);
+ }
+
+ for (i = 0; i < length; i++) {
+ const struct chreq *chr = &chreq[i];
+ if ((ra & chr->mask) == chr->val)
+ return reason_by_chreq[chr->type];
+ }
+ LOGP(DRR, LOGL_ERROR, "Unknown CHANNEL REQUEST REASON 0x%02x\n", ra);
+ return GSM_CHREQ_REASON_OTHER;
+}
+
+/* 7.1.7 and 9.1.7: RR CHANnel RELease */
+int gsm48_send_rr_release(struct gsm_lchan *lchan)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ u_int8_t *cause;
+
+ msg->lchan = lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_CHAN_REL;
+
+ cause = msgb_put(msg, 1);
+ cause[0] = GSM48_RR_CAUSE_NORMAL;
+
+ DEBUGP(DRR, "Sending Channel Release: Chan: Number: %d Type: %d\n",
+ lchan->nr, lchan->type);
+
+ /* Send actual release request to MS */
+ gsm48_sendmsg(msg);
+ /* FIXME: Start Timer T3109 */
+
+ /* Deactivate the SACCH on the BTS side */
+ return rsl_deact_sacch(lchan);
+}
+
+int send_siemens_mrpci(struct gsm_lchan *lchan,
+ u_int8_t *classmark2_lv)
+{
+ struct rsl_mrpci mrpci;
+
+ if (classmark2_lv[0] < 2)
+ return -EINVAL;
+
+ mrpci.power_class = classmark2_lv[1] & 0x7;
+ mrpci.vgcs_capable = classmark2_lv[2] & (1 << 1);
+ mrpci.vbs_capable = classmark2_lv[2] & (1 <<2);
+ mrpci.gsm_phase = (classmark2_lv[1]) >> 5 & 0x3;
+
+ return rsl_siemens_mrpci(lchan, &mrpci);
+}
+
+int gsm48_extract_mi(uint8_t *classmark2_lv, int length, char *mi_string, uint8_t *mi_type)
+{
+ /* Check the size for the classmark */
+ if (length < 1 + *classmark2_lv)
+ return -1;
+
+ u_int8_t *mi_lv = classmark2_lv + *classmark2_lv + 1;
+ if (length < 2 + *classmark2_lv + mi_lv[0])
+ return -2;
+
+ *mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
+ return gsm48_mi_to_string(mi_string, GSM48_MI_SIZE, mi_lv+1, *mi_lv);
+}
+
+int gsm48_paging_extract_mi(struct gsm48_pag_resp *resp, int length,
+ char *mi_string, u_int8_t *mi_type)
+{
+ static const uint32_t classmark_offset =
+ offsetof(struct gsm48_pag_resp, classmark2);
+ u_int8_t *classmark2_lv = (uint8_t *) &resp->classmark2;
+ return gsm48_extract_mi(classmark2_lv, length - classmark_offset,
+ mi_string, mi_type);
+}
+
+int gsm48_handle_paging_resp(struct gsm_subscriber_connection *conn,
+ struct msgb *msg, struct gsm_subscriber *subscr)
+{
+ struct gsm_bts *bts = msg->lchan->ts->trx->bts;
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ u_int8_t *classmark2_lv = gh->data + 1;
+
+ if (is_siemens_bts(bts))
+ send_siemens_mrpci(msg->lchan, classmark2_lv);
+
+ if (!conn->subscr) {
+ conn->subscr = subscr;
+ } else if (conn->subscr != subscr) {
+ LOGP(DRR, LOGL_ERROR, "<- Channel already owned by someone else?\n");
+ subscr_put(subscr);
+ return -EINVAL;
+ } else {
+ DEBUGP(DRR, "<- Channel already owned by us\n");
+ subscr_put(subscr);
+ subscr = conn->subscr;
+ }
+
+ counter_inc(bts->network->stats.paging.completed);
+
+ /* Stop paging on the bts we received the paging response */
+ paging_request_stop(conn->bts, subscr, conn, msg);
+ return 0;
+}
+
+/* Chapter 9.1.9: Ciphering Mode Command */
+int gsm48_send_rr_ciph_mode(struct gsm_lchan *lchan, int want_imeisv)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+ u_int8_t ciph_mod_set;
+
+ msg->lchan = lchan;
+
+ DEBUGP(DRR, "TX CIPHERING MODE CMD\n");
+
+ if (lchan->encr.alg_id <= RSL_ENC_ALG_A5(0))
+ ciph_mod_set = 0;
+ else
+ ciph_mod_set = (lchan->encr.alg_id-2)<<1 | 1;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_CIPH_M_CMD;
+ gh->data[0] = (want_imeisv & 0x1) << 4 | (ciph_mod_set & 0xf);
+
+ return rsl_encryption_cmd(msg);
+}
+
+static void gsm48_cell_desc(struct gsm48_cell_desc *cd,
+ const struct gsm_bts *bts)
+{
+ cd->ncc = (bts->bsic >> 3 & 0x7);
+ cd->bcc = (bts->bsic & 0x7);
+ cd->arfcn_hi = bts->c0->arfcn >> 8;
+ cd->arfcn_lo = bts->c0->arfcn & 0xff;
+}
+
+void gsm48_lchan2chan_desc(struct gsm48_chan_desc *cd,
+ const struct gsm_lchan *lchan)
+{
+ u_int16_t arfcn = lchan->ts->trx->arfcn & 0x3ff;
+
+ cd->chan_nr = lchan2chan_nr(lchan);
+ if (!lchan->ts->hopping.enabled) {
+ cd->h0.tsc = lchan->ts->trx->bts->tsc;
+ cd->h0.h = 0;
+ cd->h0.arfcn_high = arfcn >> 8;
+ cd->h0.arfcn_low = arfcn & 0xff;
+ } else {
+ cd->h1.tsc = lchan->ts->trx->bts->tsc;
+ cd->h1.h = 1;
+ cd->h1.maio_high = lchan->ts->hopping.maio >> 2;
+ cd->h1.maio_low = lchan->ts->hopping.maio & 0x03;
+ cd->h1.hsn = lchan->ts->hopping.hsn;
+ }
+}
+
+#define GSM48_HOCMD_CCHDESC_LEN 16
+
+/* Chapter 9.1.15: Handover Command */
+int gsm48_send_ho_cmd(struct gsm_lchan *old_lchan, struct gsm_lchan *new_lchan,
+ u_int8_t power_command, u_int8_t ho_ref)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ struct gsm48_ho_cmd *ho =
+ (struct gsm48_ho_cmd *) msgb_put(msg, sizeof(*ho));
+
+ msg->lchan = old_lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_HANDO_CMD;
+
+ /* mandatory bits */
+ gsm48_cell_desc(&ho->cell_desc, new_lchan->ts->trx->bts);
+ gsm48_lchan2chan_desc(&ho->chan_desc, new_lchan);
+ ho->ho_ref = ho_ref;
+ ho->power_command = power_command;
+
+ if (new_lchan->ts->hopping.enabled) {
+ struct gsm_bts *bts = new_lchan->ts->trx->bts;
+ struct gsm48_system_information_type_1 *si1;
+ uint8_t *cur;
+
+ si1 = GSM_BTS_SI(bts, SYSINFO_TYPE_1);
+ /* Copy the Cell Chan Desc (ARFCNS in this cell) */
+ msgb_put_u8(msg, GSM48_IE_CELL_CH_DESC);
+ cur = msgb_put(msg, GSM48_HOCMD_CCHDESC_LEN);
+ memcpy(cur, si1->cell_channel_description,
+ GSM48_HOCMD_CCHDESC_LEN);
+ /* Copy the Mobile Allocation */
+ msgb_tlv_put(msg, GSM48_IE_MA_BEFORE,
+ new_lchan->ts->hopping.ma_len,
+ new_lchan->ts->hopping.ma_data);
+ }
+ /* FIXME: optional bits for type of synchronization? */
+
+ return gsm48_sendmsg(msg);
+}
+
+/* Chapter 9.1.2: Assignment Command */
+int gsm48_send_rr_ass_cmd(struct gsm_lchan *dest_lchan, struct gsm_lchan *lchan, u_int8_t power_command)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ struct gsm48_ass_cmd *ass =
+ (struct gsm48_ass_cmd *) msgb_put(msg, sizeof(*ass));
+
+ DEBUGP(DRR, "-> ASSIGNMENT COMMAND tch_mode=0x%02x\n", lchan->tch_mode);
+
+ msg->lchan = dest_lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_ASS_CMD;
+
+ /*
+ * fill the channel information element, this code
+ * should probably be shared with rsl_rx_chan_rqd(),
+ * gsm48_tx_chan_mode_modify. But beware that 10.5.2.5
+ * 10.5.2.5.a have slightly different semantic for
+ * the chan_desc. But as long as multi-slot configurations
+ * are not used we seem to be fine.
+ */
+ gsm48_lchan2chan_desc(&ass->chan_desc, lchan);
+ ass->power_command = power_command;
+
+ /* optional: cell channel description */
+
+ msgb_tv_put(msg, GSM48_IE_CHANMODE_1, lchan->tch_mode);
+
+ /* mobile allocation in case of hopping */
+ if (lchan->ts->hopping.enabled) {
+ msgb_tlv_put(msg, GSM48_IE_MA_BEFORE, lchan->ts->hopping.ma_len,
+ lchan->ts->hopping.ma_data);
+ }
+
+ /* in case of multi rate we need to attach a config */
+ if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+ if (lchan->mr_conf.ver == 0) {
+ LOGP(DRR, LOGL_ERROR, "BUG: Using multirate codec "
+ "without multirate config.\n");
+ } else {
+ u_int8_t *data = msgb_put(msg, 4);
+ data[0] = GSM48_IE_MUL_RATE_CFG;
+ data[1] = 0x2;
+ memcpy(&data[2], &lchan->mr_conf, 2);
+ }
+ }
+
+ return gsm48_sendmsg(msg);
+}
+
+/* 9.1.5 Channel mode modify: Modify the mode on the MS side */
+int gsm48_tx_chan_mode_modify(struct gsm_lchan *lchan, u_int8_t mode)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ struct gsm48_chan_mode_modify *cmm =
+ (struct gsm48_chan_mode_modify *) msgb_put(msg, sizeof(*cmm));
+
+ DEBUGP(DRR, "-> CHANNEL MODE MODIFY mode=0x%02x\n", mode);
+
+ lchan->tch_mode = mode;
+ msg->lchan = lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_CHAN_MODE_MODIF;
+
+ /* fill the channel information element, this code
+ * should probably be shared with rsl_rx_chan_rqd() */
+ gsm48_lchan2chan_desc(&cmm->chan_desc, lchan);
+ cmm->mode = mode;
+
+ /* in case of multi rate we need to attach a config */
+ if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+ if (lchan->mr_conf.ver == 0) {
+ LOGP(DRR, LOGL_ERROR, "BUG: Using multirate codec "
+ "without multirate config.\n");
+ } else {
+ u_int8_t *data = msgb_put(msg, 4);
+ data[0] = GSM48_IE_MUL_RATE_CFG;
+ data[1] = 0x2;
+ memcpy(&data[2], &lchan->mr_conf, 2);
+ }
+ }
+
+ return gsm48_sendmsg(msg);
+}
+
+int gsm48_lchan_modify(struct gsm_lchan *lchan, u_int8_t lchan_mode)
+{
+ int rc;
+
+ rc = gsm48_tx_chan_mode_modify(lchan, lchan_mode);
+ if (rc < 0)
+ return rc;
+
+ return rc;
+}
+
+int gsm48_rx_rr_modif_ack(struct msgb *msg)
+{
+ int rc;
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm48_chan_mode_modify *mod =
+ (struct gsm48_chan_mode_modify *) gh->data;
+
+ DEBUGP(DRR, "CHANNEL MODE MODIFY ACK\n");
+
+ if (mod->mode != msg->lchan->tch_mode) {
+ LOGP(DRR, LOGL_ERROR, "CHANNEL MODE change failed. Wanted: %d Got: %d\n",
+ msg->lchan->tch_mode, mod->mode);
+ return -1;
+ }
+
+ /* update the channel type */
+ switch (mod->mode) {
+ case GSM48_CMODE_SIGN:
+ msg->lchan->rsl_cmode = RSL_CMOD_SPD_SIGN;
+ break;
+ case GSM48_CMODE_SPEECH_V1:
+ case GSM48_CMODE_SPEECH_EFR:
+ case GSM48_CMODE_SPEECH_AMR:
+ msg->lchan->rsl_cmode = RSL_CMOD_SPD_SPEECH;
+ break;
+ case GSM48_CMODE_DATA_14k5:
+ case GSM48_CMODE_DATA_12k0:
+ case GSM48_CMODE_DATA_6k0:
+ case GSM48_CMODE_DATA_3k6:
+ msg->lchan->rsl_cmode = RSL_CMOD_SPD_DATA;
+ break;
+ }
+
+ /* We've successfully modified the MS side of the channel,
+ * now go on to modify the BTS side of the channel */
+ rc = rsl_chan_mode_modify_req(msg->lchan);
+
+ /* FIXME: we not only need to do this after mode modify, but
+ * also after channel activation */
+ if (is_ipaccess_bts(msg->lchan->ts->trx->bts) && mod->mode != GSM48_CMODE_SIGN)
+ rsl_ipacc_crcx(msg->lchan);
+ return rc;
+}
+
+int gsm48_parse_meas_rep(struct gsm_meas_rep *rep, struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ u_int8_t *data = gh->data;
+ struct gsm_bts *bts = msg->lchan->ts->trx->bts;
+ struct bitvec *nbv = &bts->si_common.neigh_list;
+ struct gsm_meas_rep_cell *mrc;
+
+ if (gh->msg_type != GSM48_MT_RR_MEAS_REP)
+ return -EINVAL;
+
+ if (data[0] & 0x80)
+ rep->flags |= MEAS_REP_F_BA1;
+ if (data[0] & 0x40)
+ rep->flags |= MEAS_REP_F_UL_DTX;
+ if ((data[1] & 0x40) == 0x00)
+ rep->flags |= MEAS_REP_F_DL_VALID;
+
+ rep->dl.full.rx_lev = data[0] & 0x3f;
+ rep->dl.sub.rx_lev = data[1] & 0x3f;
+ rep->dl.full.rx_qual = (data[3] >> 4) & 0x7;
+ rep->dl.sub.rx_qual = (data[3] >> 1) & 0x7;
+
+ rep->num_cell = ((data[3] >> 6) & 0x3) | ((data[2] & 0x01) << 2);
+ if (rep->num_cell < 1 || rep->num_cell > 6)
+ return 0;
+
+ /* an encoding nightmare in perfection */
+ mrc = &rep->cell[0];
+ mrc->rxlev = data[3] & 0x3f;
+ mrc->neigh_idx = data[4] >> 3;
+ mrc->arfcn = bitvec_get_nth_set_bit(nbv, mrc->neigh_idx + 1);
+ mrc->bsic = ((data[4] & 0x07) << 3) | (data[5] >> 5);
+ if (rep->num_cell < 2)
+ return 0;
+
+ mrc = &rep->cell[1];
+ mrc->rxlev = ((data[5] & 0x1f) << 1) | (data[6] >> 7);
+ mrc->neigh_idx = (data[6] >> 2) & 0x1f;
+ mrc->arfcn = bitvec_get_nth_set_bit(nbv, mrc->neigh_idx + 1);
+ mrc->bsic = ((data[6] & 0x03) << 4) | (data[7] >> 4);
+ if (rep->num_cell < 3)
+ return 0;
+
+ mrc = &rep->cell[2];
+ mrc->rxlev = ((data[7] & 0x0f) << 2) | (data[8] >> 6);
+ mrc->neigh_idx = (data[8] >> 1) & 0x1f;
+ mrc->arfcn = bitvec_get_nth_set_bit(nbv, mrc->neigh_idx + 1);
+ mrc->bsic = ((data[8] & 0x01) << 5) | (data[9] >> 3);
+ if (rep->num_cell < 4)
+ return 0;
+
+ mrc = &rep->cell[3];
+ mrc->rxlev = ((data[9] & 0x07) << 3) | (data[10] >> 5);
+ mrc->neigh_idx = data[10] & 0x1f;
+ mrc->arfcn = bitvec_get_nth_set_bit(nbv, mrc->neigh_idx + 1);
+ mrc->bsic = data[11] >> 2;
+ if (rep->num_cell < 5)
+ return 0;
+
+ mrc = &rep->cell[4];
+ mrc->rxlev = ((data[11] & 0x03) << 4) | (data[12] >> 4);
+ mrc->neigh_idx = ((data[12] & 0xf) << 1) | (data[13] >> 7);
+ mrc->arfcn = bitvec_get_nth_set_bit(nbv, mrc->neigh_idx + 1);
+ mrc->bsic = (data[13] >> 1) & 0x3f;
+ if (rep->num_cell < 6)
+ return 0;
+
+ mrc = &rep->cell[5];
+ mrc->rxlev = ((data[13] & 0x01) << 5) | (data[14] >> 3);
+ mrc->neigh_idx = ((data[14] & 0x07) << 2) | (data[15] >> 6);
+ mrc->arfcn = bitvec_get_nth_set_bit(nbv, mrc->neigh_idx + 1);
+ mrc->bsic = data[15] & 0x3f;
+
+ return 0;
+}
+
+struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value)
+{
+ struct msgb *msg;
+ struct gsm48_hdr *gh;
+
+ msg = gsm48_msgb_alloc();
+ if (!msg)
+ return NULL;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
+ gh->data[0] = value;
+
+ return msg;
+}
+
+struct msgb *gsm48_create_loc_upd_rej(uint8_t cause)
+{
+ struct gsm48_hdr *gh;
+ struct msgb *msg;
+
+ msg = gsm48_msgb_alloc();
+ if (!msg)
+ return NULL;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT;
+ gh->data[0] = cause;
+ return msg;
+}