diff options
Diffstat (limited to 'src/libbsc/gsm_04_08_utils.c')
-rw-r--r-- | src/libbsc/gsm_04_08_utils.c | 687 |
1 files changed, 687 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 000000000..3447d27cb --- /dev/null +++ b/src/libbsc/gsm_04_08_utils.c @@ -0,0 +1,687 @@ +/* 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 <osmocom/core/msgb.h> +#include <osmocom/gsm/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> +#include <openbsc/bsc_api.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->dst = msg->lchan->ts->trx->rsl_link; + + msg->l3h = msg->data; + return rsl_data_request(msg, 0); +} + +/* Section 9.1.8 / Table 9.9 */ +struct chreq { + uint8_t val; + uint8_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 }, + { 0x70, 0xf8, CHREQ_T_PDCH_TWO_PHASE }, + { 0x78, 0xfc, CHREQ_T_PDCH_ONE_PHASE }, + { 0x78, 0xfa, CHREQ_T_PDCH_ONE_PHASE }, + { 0x78, 0xf9, CHREQ_T_PDCH_ONE_PHASE }, + { 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 }, + { 0x70, 0xf8, CHREQ_T_PDCH_TWO_PHASE }, + { 0x78, 0xfc, CHREQ_T_PDCH_ONE_PHASE }, + { 0x78, 0xfa, CHREQ_T_PDCH_ONE_PHASE }, + { 0x78, 0xf9, CHREQ_T_PDCH_ONE_PHASE }, + { 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_PDCH_ONE_PHASE] = GSM_LCHAN_PDTCH, + [CHREQ_T_PDCH_TWO_PHASE] = GSM_LCHAN_PDTCH, + [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_PDCH_ONE_PHASE] = GSM_CHREQ_REASON_PDCH, + [CHREQ_T_PDCH_TWO_PHASE] = GSM_CHREQ_REASON_PDCH, + [CHREQ_T_RESERVED_SDCCH] = GSM_CHREQ_REASON_OTHER, + [CHREQ_T_RESERVED_IGNORE] = GSM_CHREQ_REASON_OTHER, +}; + +/* verify that the two tables match */ +osmo_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, uint8_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; +} + +int get_reason_by_chreq(uint8_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; +} + +static void mr_config_for_ms(struct gsm_lchan *lchan, struct msgb *msg) +{ + if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) + msgb_tlv_put(msg, GSM48_IE_MUL_RATE_CFG, lchan->mr_ms_lv[0], + lchan->mr_ms_lv + 1); +} + +/* 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_name("GSM 04.08 RR REL"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + uint8_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 */ + return gsm48_sendmsg(msg); +} + +int send_siemens_mrpci(struct gsm_lchan *lchan, + uint8_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; + + uint8_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, uint8_t *mi_type) +{ + static const uint32_t classmark_offset = + offsetof(struct gsm48_pag_resp, classmark2); + uint8_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 bsc_subscr *bsub) +{ + struct gsm_bts *bts = msg->lchan->ts->trx->bts; + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t *classmark2_lv = gh->data + 1; + + if (is_siemens_bts(bts)) + send_siemens_mrpci(msg->lchan, classmark2_lv); + + if (!conn->bsub) { + conn->bsub = bsub; + } else if (conn->bsub != bsub) { + LOGP(DRR, LOGL_ERROR, + "<- Channel already owned by someone else?\n"); + bsc_subscr_put(bsub); + return -EINVAL; + } else { + DEBUGP(DRR, "<- Channel already owned by us\n"); + bsc_subscr_put(bsub); + bsub = conn->bsub; + } + + rate_ctr_inc(&bts->network->bsc_ctrs->ctr[BSC_CTR_PAGING_COMPLETED]); + + /* Stop paging on the bts we received the paging response */ + paging_request_stop(&bts->network->bts_list, conn->bts, bsub, 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_name("GSM 04.08 CIPH"); + struct gsm48_hdr *gh; + uint8_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) +{ + uint16_t arfcn = lchan->ts->trx->arfcn & 0x3ff; + + cd->chan_nr = gsm_lchan2chan_nr(lchan); + if (!lchan->ts->hopping.enabled) { + cd->h0.tsc = gsm_ts_tsc(lchan->ts); + cd->h0.h = 0; + cd->h0.arfcn_high = arfcn >> 8; + cd->h0.arfcn_low = arfcn & 0xff; + } else { + cd->h1.tsc = gsm_ts_tsc(lchan->ts); + 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; + } +} + +/*! \brief Encode a TS 04.08 multirate config LV according to 10.5.2.21aa + * \param[out] lv caller-allocated buffer of 7 bytes. First octet is IS length + * \param[in] mr multi-rate configuration to encode + * \param[in] modes array describing the AMR modes + * \returns 0 on success */ +int gsm48_multirate_config(uint8_t *lv, const struct amr_multirate_conf *mr, const struct amr_mode *modes) +{ + int num = 0, i; + + for (i = 0; i < 8; i++) { + if (((mr->gsm48_ie[1] >> i) & 1)) + num++; + } + if (num > 4) { + LOGP(DRR, LOGL_ERROR, "BUG: Using multirate codec with too " + "many modes in config.\n"); + num = 4; + } + if (num < 1) { + LOGP(DRR, LOGL_ERROR, "BUG: Using multirate codec with no " + "mode in config.\n"); + num = 1; + } + + lv[0] = (num == 1) ? 2 : (num + 2); + memcpy(lv + 1, mr->gsm48_ie, 2); + if (num == 1) + return 0; + + lv[3] = modes[0].threshold & 0x3f; + lv[4] = modes[0].hysteresis << 4; + if (num == 2) + return 0; + lv[4] |= (modes[1].threshold & 0x3f) >> 2; + lv[5] = modes[1].threshold << 6; + lv[5] |= (modes[1].hysteresis & 0x0f) << 2; + if (num == 3) + return 0; + lv[5] |= (modes[2].threshold & 0x3f) >> 4; + lv[6] = modes[2].threshold << 4; + lv[6] |= modes[2].hysteresis & 0x0f; + + return 0; +} + +#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, + uint8_t power_command, uint8_t ho_ref) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 HO CMD"); + 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, uint8_t power_command) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ASS CMD"); + 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_lchan_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 */ + mr_config_for_ms(lchan, msg); + + return gsm48_sendmsg(msg); +} + +/* 9.1.5 Channel mode modify: Modify the mode on the MS side */ +int gsm48_lchan_modify(struct gsm_lchan *lchan, uint8_t mode) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CHN MOD"); + 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 */ + mr_config_for_ms(lchan, msg); + + return gsm48_sendmsg(msg); +} + +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); + uint8_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[2] >> 4) & 0x7; + rep->dl.sub.rx_qual = (data[2] >> 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; +} + +/* 9.2.5 CM service accept */ +int gsm48_tx_mm_serv_ack(struct gsm_subscriber_connection *conn) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERV ACK"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + msg->lchan = conn->lchan; + + gh->proto_discr = GSM48_PDISC_MM; + gh->msg_type = GSM48_MT_MM_CM_SERV_ACC; + + DEBUGP(DMM, "-> CM SERVICE ACK\n"); + + return gsm0808_submit_dtap(conn, msg, 0, 0); +} + +/* 9.2.6 CM service reject */ +int gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn, + enum gsm48_reject_value value) +{ + struct msgb *msg; + + msg = gsm48_create_mm_serv_rej(value); + if (!msg) { + LOGP(DMM, LOGL_ERROR, "Failed to allocate CM Service Reject.\n"); + return -1; + } + + DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value); + + return gsm0808_submit_dtap(conn, msg, 0, 0); +} |