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Diffstat (limited to 'openbsc/src/abis_rsl.c')
| -rw-r--r-- | openbsc/src/abis_rsl.c | 1263 |
1 files changed, 1263 insertions, 0 deletions
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c new file mode 100644 index 000000000..4b2a7fccf --- /dev/null +++ b/openbsc/src/abis_rsl.c @@ -0,0 +1,1263 @@ +/* GSM Radio Signalling Link messages on the A-bis interface + * 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */ + +/* (C) 2008-2009 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 General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <sys/types.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <openbsc/gsm_data.h> +#include <openbsc/gsm_04_08.h> +#include <openbsc/abis_rsl.h> +#include <openbsc/chan_alloc.h> +#include <openbsc/debug.h> +#include <openbsc/tlv.h> +#include <openbsc/paging.h> +#include <openbsc/signal.h> + +#define RSL_ALLOC_SIZE 1024 +#define RSL_ALLOC_HEADROOM 128 + +#define MAX(a, b) (a) >= (b) ? (a) : (b) + +static const struct tlv_definition rsl_att_tlvdef = { + .def = { + [RSL_IE_CHAN_NR] = { TLV_TYPE_TV }, + [RSL_IE_LINK_IDENT] = { TLV_TYPE_TV }, + [RSL_IE_ACT_TYPE] = { TLV_TYPE_TV }, + [RSL_IE_BS_POWER] = { TLV_TYPE_TV }, + [RSL_IE_CHAN_IDENT] = { TLV_TYPE_TLV }, + [RSL_IE_CHAN_MODE] = { TLV_TYPE_TLV }, + [RSL_IE_ENCR_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_FRAME_NUMBER] = { TLV_TYPE_FIXED, 2 }, + [RSL_IE_HANDO_REF] = { TLV_TYPE_TV }, + [RSL_IE_L1_INFO] = { TLV_TYPE_FIXED, 2 }, + [RSL_IE_L3_INFO] = { TLV_TYPE_TL16V }, + [RSL_IE_MS_IDENTITY] = { TLV_TYPE_TLV }, + [RSL_IE_MS_POWER] = { TLV_TYPE_TV }, + [RSL_IE_PAGING_GROUP] = { TLV_TYPE_TV }, + [RSL_IE_PAGING_LOAD] = { TLV_TYPE_FIXED, 2 }, + [RSL_IE_PYHS_CONTEXT] = { TLV_TYPE_TLV }, + [RSL_IE_ACCESS_DELAY] = { TLV_TYPE_TV }, + [RSL_IE_RACH_LOAD] = { TLV_TYPE_TLV }, + [RSL_IE_REQ_REFERENCE] = { TLV_TYPE_FIXED, 3 }, + [RSL_IE_RELEASE_MODE] = { TLV_TYPE_TV }, + [RSL_IE_RESOURCE_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_RLM_CAUSE] = { TLV_TYPE_TLV }, + [RSL_IE_STARTNG_TIME] = { TLV_TYPE_FIXED, 2 }, + [RSL_IE_TIMING_ADVANCE] = { TLV_TYPE_TV }, + [RSL_IE_UPLINK_MEAS] = { TLV_TYPE_TLV }, + [RSL_IE_CAUSE] = { TLV_TYPE_TLV }, + [RSL_IE_MEAS_RES_NR] = { TLV_TYPE_TV }, + [RSL_IE_MSG_ID] = { TLV_TYPE_TV }, + [RSL_IE_SYSINFO_TYPE] = { TLV_TYPE_TV }, + [RSL_IE_MS_POWER_PARAM] = { TLV_TYPE_TLV }, + [RSL_IE_BS_POWER_PARAM] = { TLV_TYPE_TLV }, + [RSL_IE_PREPROC_PARAM] = { TLV_TYPE_TLV }, + [RSL_IE_PREPROC_MEAS] = { TLV_TYPE_TLV }, + [RSL_IE_IMM_ASS_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_SMSCB_INFO] = { TLV_TYPE_FIXED, 23 }, + [RSL_IE_MS_TIMING_OFFSET] = { TLV_TYPE_TV }, + [RSL_IE_ERR_MSG] = { TLV_TYPE_TLV }, + [RSL_IE_FULL_BCCH_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_CHAN_NEEDED] = { TLV_TYPE_TV }, + [RSL_IE_CB_CMD_TYPE] = { TLV_TYPE_TV }, + [RSL_IE_SMSCB_MSG] = { TLV_TYPE_TLV }, + [RSL_IE_FULL_IMM_ASS_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_SACCH_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_CBCH_LOAD_INFO] = { TLV_TYPE_TV }, + [RSL_IE_SMSCB_CHAN_INDICATOR] = { TLV_TYPE_TV }, + [RSL_IE_GROUP_CALL_REF] = { TLV_TYPE_TLV }, + [RSL_IE_CHAN_DESC] = { TLV_TYPE_TLV }, + [RSL_IE_NCH_DRX_INFO] = { TLV_TYPE_TLV }, + [RSL_IE_CMD_INDICATOR] = { TLV_TYPE_TLV }, + [RSL_IE_EMLPP_PRIO] = { TLV_TYPE_TV }, + [RSL_IE_UIC] = { TLV_TYPE_TLV }, + [RSL_IE_MAIN_CHAN_REF] = { TLV_TYPE_TV }, + [RSL_IE_MR_CONFIG] = { TLV_TYPE_TLV }, + [RSL_IE_MR_CONTROL] = { TLV_TYPE_TV }, + [RSL_IE_SUP_CODEC_TYPES] = { TLV_TYPE_TLV }, + [RSL_IE_CODEC_CONFIG] = { TLV_TYPE_TLV }, + [RSL_IE_RTD] = { TLV_TYPE_TV }, + [RSL_IE_TFO_STATUS] = { TLV_TYPE_TV }, + [RSL_IE_LLP_APDU] = { TLV_TYPE_TLV }, + [RSL_IE_IPAC_REMOTE_IP] = { TLV_TYPE_FIXED, 4 }, + [RSL_IE_IPAC_REMOTE_PORT] = { TLV_TYPE_FIXED, 2 }, + [RSL_IE_IPAC_LOCAL_IP] = { TLV_TYPE_FIXED, 4 }, + [RSL_IE_IPAC_LOCAL_PORT] = { TLV_TYPE_FIXED, 2 }, + [0xf4] = { TLV_TYPE_TV }, + [0xf8] = { TLV_TYPE_FIXED, 2 }, + [0xfc] = { TLV_TYPE_TV }, + }, +}; +#define rsl_tlv_parse(dec, buf, len) \ + tlv_parse(dec, &rsl_att_tlvdef, buf, len, 0, 0) + +static u_int8_t mdisc_by_msgtype(u_int8_t msg_type) +{ + /* mask off the transparent bit ? */ + msg_type &= 0xfe; + + if ((msg_type & 0xf0) == 0x00) + return ABIS_RSL_MDISC_RLL; + if ((msg_type & 0xf0) == 0x10) { + if (msg_type >= 0x19 && msg_type <= 0x22) + return ABIS_RSL_MDISC_TRX; + else + return ABIS_RSL_MDISC_COM_CHAN; + } + if ((msg_type & 0xe0) == 0x20) + return ABIS_RSL_MDISC_DED_CHAN; + + return ABIS_RSL_MDISC_LOC; +} + +static inline void init_dchan_hdr(struct abis_rsl_dchan_hdr *dh, + u_int8_t msg_type) +{ + dh->c.msg_discr = mdisc_by_msgtype(msg_type); + dh->c.msg_type = msg_type; + dh->ie_chan = RSL_IE_CHAN_NR; +} + +static inline void init_llm_hdr(struct abis_rsl_rll_hdr *dh, + u_int8_t msg_type) +{ + /* dh->c.msg_discr = mdisc_by_msgtype(msg_type); */ + dh->c.msg_discr = ABIS_RSL_MDISC_RLL; + dh->c.msg_type = msg_type; + dh->ie_chan = RSL_IE_CHAN_NR; + dh->ie_link_id = RSL_IE_LINK_IDENT; +} + + +/* encode channel number as per Section 9.3.1 */ +u_int8_t rsl_enc_chan_nr(u_int8_t type, u_int8_t subch, u_int8_t timeslot) +{ + u_int8_t ret; + + ret = (timeslot & 0x07) | type; + + switch (type) { + case RSL_CHAN_Lm_ACCHs: + subch &= 0x01; + break; + case RSL_CHAN_SDCCH4_ACCH: + subch &= 0x07; + break; + case RSL_CHAN_SDCCH8_ACCH: + subch &= 0x07; + break; + default: + /* no subchannels allowed */ + subch = 0x00; + break; + } + ret |= (subch << 3); + + return ret; +} + +/* determine logical channel based on TRX and channel number IE */ +struct gsm_lchan *lchan_lookup(struct gsm_bts_trx *trx, u_int8_t chan_nr) +{ + struct gsm_lchan *lchan; + u_int8_t ts_nr = chan_nr & 0x07; + u_int8_t cbits = chan_nr >> 3; + u_int8_t lch_idx; + struct gsm_bts_trx_ts *ts = &trx->ts[ts_nr]; + + if (cbits == 0x01) { + lch_idx = 0; /* TCH/F */ + if (ts->pchan != GSM_PCHAN_TCH_F) + fprintf(stderr, "chan_nr=0x%02x but pchan=%u\n", + chan_nr, ts->pchan); + } else if ((cbits & 0x1e) == 0x02) { + lch_idx = cbits & 0x1; /* TCH/H */ + if (ts->pchan != GSM_PCHAN_TCH_H) + fprintf(stderr, "chan_nr=0x%02x but pchan=%u\n", + chan_nr, ts->pchan); + } else if ((cbits & 0x1c) == 0x04) { + lch_idx = cbits & 0x3; /* SDCCH/4 */ + if (ts->pchan != GSM_PCHAN_CCCH_SDCCH4) + fprintf(stderr, "chan_nr=0x%02x but pchan=%u\n", + chan_nr, ts->pchan); + } else if ((cbits & 0x18) == 0x08) { + lch_idx = cbits & 0x7; /* SDCCH/8 */ + if (ts->pchan != GSM_PCHAN_SDCCH8_SACCH8C) + fprintf(stderr, "chan_nr=0x%02x but pchan=%u\n", + chan_nr, ts->pchan); + } else if (cbits == 0x10 || cbits == 0x11 || cbits == 0x12) { + lch_idx = 0; + if (ts->pchan != GSM_PCHAN_CCCH && + ts->pchan != GSM_PCHAN_CCCH_SDCCH4) + fprintf(stderr, "chan_nr=0x%02x but pchan=%u\n", + chan_nr, ts->pchan); + /* FIXME: we should not return first sdcch4 !!! */ + } else { + fprintf(stderr, "unknown chan_nr=0x%02x\n", chan_nr); + return NULL; + } + + lchan = &ts->lchan[lch_idx]; + + return lchan; +} + +u_int8_t lchan2chan_nr(struct gsm_lchan *lchan) +{ + struct gsm_bts_trx_ts *ts = lchan->ts; + u_int8_t cbits, chan_nr; + + switch (ts->pchan) { + case GSM_PCHAN_TCH_F: + cbits = 0x01; + break; + case GSM_PCHAN_TCH_H: + cbits = 0x02; + cbits += lchan->nr; + break; + case GSM_PCHAN_CCCH_SDCCH4: + cbits = 0x04; + cbits += lchan->nr; + break; + case GSM_PCHAN_SDCCH8_SACCH8C: + cbits = 0x08; + cbits += lchan->nr; + break; + default: + case GSM_PCHAN_CCCH: + cbits = 0x10; + break; + } + + chan_nr = (cbits << 3) | (ts->nr & 0x7); + + return chan_nr; +} + +/* As per TS 03.03 Section 2.2, the IMSI has 'not more than 15 digits' */ +u_int64_t str_to_imsi(const char *imsi_str) +{ + u_int64_t ret; + + ret = strtoull(imsi_str, NULL, 10); + + return ret; +} + +/* Table 5 Clause 7 TS 05.02 */ +unsigned int n_pag_blocks(int bs_ccch_sdcch_comb, unsigned int bs_ag_blks_res) +{ + if (!bs_ccch_sdcch_comb) + return 9 - bs_ag_blks_res; + else + return 3 - bs_ag_blks_res; +} + +/* Chapter 6.5.2 of TS 05.02 */ +unsigned int get_ccch_group(u_int64_t imsi, unsigned int bs_cc_chans, + unsigned int n_pag_blocks) +{ + return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) / n_pag_blocks; +} + +/* Chapter 6.5.2 of TS 05.02 */ +unsigned int get_paging_group(u_int64_t imsi, unsigned int bs_cc_chans, + int n_pag_blocks) +{ + return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks; +} + +static struct msgb *rsl_msgb_alloc(void) +{ + return msgb_alloc_headroom(RSL_ALLOC_SIZE, RSL_ALLOC_HEADROOM); +} + +#define MACBLOCK_SIZE 23 +static void pad_macblock(u_int8_t *out, const u_int8_t *in, int len) +{ + memcpy(out, in, len); + + if (len < MACBLOCK_SIZE) + memset(out+len, 0x2b, MACBLOCK_SIZE-len); +} + +static void print_rsl_cause(u_int8_t *cause_tlv) +{ + u_int8_t cause_len; + int i; + + if (cause_tlv[0] != RSL_IE_CAUSE) + return; + + cause_len = cause_tlv[1]; + DEBUGPC(DRSL, "CAUSE: "); + for (i = 0; i < cause_len; i++) + DEBUGPC(DRSL, "%02x ", cause_tlv[2+i]); +} + +/* Send a BCCH_INFO message as per Chapter 8.5.1 */ +int rsl_bcch_info(struct gsm_bts_trx *trx, u_int8_t type, + const u_int8_t *data, int len) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof*dh); + init_dchan_hdr(dh, RSL_MT_BCCH_INFO); + dh->chan_nr = RSL_CHAN_BCCH; + + msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type); + msgb_tlv_put(msg, RSL_IE_FULL_BCCH_INFO, len, data); + + msg->trx = trx; + + return abis_rsl_sendmsg(msg); +} + +int rsl_sacch_filling(struct gsm_bts_trx *trx, u_int8_t type, + const u_int8_t *data, int len) +{ + struct abis_rsl_common_hdr *ch; + struct msgb *msg = rsl_msgb_alloc(); + + ch = (struct abis_rsl_common_hdr *) msgb_put(msg, sizeof(*ch)); + ch->msg_discr = ABIS_RSL_MDISC_TRX; + ch->msg_type = RSL_MT_SACCH_FILL; + + msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type); + msgb_tl16v_put(msg, RSL_IE_L3_INFO, len, data); + + msg->trx = trx; + + return abis_rsl_sendmsg(msg); +} + +/* Chapter 8.4.1 */ +#if 0 +int rsl_chan_activate(struct gsm_bts_trx *trx, u_int8_t chan_nr, + u_int8_t act_type, + struct rsl_ie_chan_mode *chan_mode, + struct rsl_ie_chan_ident *chan_ident, + u_int8_t bs_power, u_int8_t ms_power, + u_int8_t ta) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_CHAN_ACTIV); + dh->chan_nr = chan_nr; + + msgb_tv_put(msg, RSL_IE_ACT_TYPE, act_type); + /* For compatibility with Phase 1 */ + msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(*chan_mode), + (u_int8_t *) chan_mode); + msgb_tlv_put(msg, RSL_IE_CHAN_IDENT, 4, + (u_int8_t *) chan_ident); +#if 0 + msgb_tlv_put(msg, RSL_IE_ENCR_INFO, 1, + (u_int8_t *) &encr_info); +#endif + msgb_tv_put(msg, RSL_IE_BS_POWER, bs_power); + msgb_tv_put(msg, RSL_IE_MS_POWER, ms_power); + msgb_tv_put(msg, RSL_IE_TIMING_ADVANCE, ta); + + msg->trx = trx; + + return abis_rsl_sendmsg(msg); +} +#endif + +int rsl_chan_activate_lchan(struct gsm_lchan *lchan, u_int8_t act_type, + u_int8_t ta, u_int8_t mode) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + + u_int8_t chan_nr = lchan2chan_nr(lchan); + u_int16_t arfcn = lchan->ts->trx->arfcn; + struct rsl_ie_chan_mode cm; + struct rsl_ie_chan_ident ci; + + memset(&cm, 0, sizeof(cm)); + /* FIXME: what to do with data calls ? */ + cm.dtx_dtu = 0x00; + switch (lchan->type) { + case GSM_LCHAN_SDCCH: + cm.spd_ind = RSL_CMOD_SPD_SIGN; + cm.chan_rt = RSL_CMOD_CRT_SDCCH; + cm.chan_rate = 0x00; + break; + case GSM_LCHAN_TCH_F: + cm.chan_rt = RSL_CMOD_CRT_TCH_Bm; + switch (mode) { + case RSL_CMOD_SPD_SIGN: + cm.spd_ind = RSL_CMOD_SPD_SIGN; + cm.chan_rate = 0x00; + break; + case RSL_CMOD_SPD_SPEECH: + cm.spd_ind = RSL_CMOD_SPD_SPEECH; + cm.chan_rate = RSL_CMOD_SP_GSM2; + break; + } + break; + case GSM_LCHAN_TCH_H: + DEBUGP(DRSL, "Unimplemented TCH_H activation\n"); + return -1; + case GSM_LCHAN_UNKNOWN: + case GSM_LCHAN_NONE: + return -1; + } + + memset(&ci, 0, sizeof(ci)); + ci.chan_desc.iei = 0x64; + ci.chan_desc.chan_nr = chan_nr; + ci.chan_desc.oct3 = (lchan->ts->trx->bts->tsc << 5) | ((arfcn & 0x3ff) >> 8); + ci.chan_desc.oct4 = arfcn & 0xff; + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_CHAN_ACTIV); + dh->chan_nr = chan_nr; + + msgb_tv_put(msg, RSL_IE_ACT_TYPE, act_type); + /* For compatibility with Phase 1 */ + msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(cm), + (u_int8_t *) &cm); + msgb_tlv_put(msg, RSL_IE_CHAN_IDENT, 4, + (u_int8_t *) &ci); +#if 0 + msgb_tlv_put(msg, RSL_IE_ENCR_INFO, 1, + (u_int8_t *) &encr_info); +#endif + msgb_tv_put(msg, RSL_IE_BS_POWER, lchan->bs_power); + msgb_tv_put(msg, RSL_IE_MS_POWER, lchan->ms_power); + msgb_tv_put(msg, RSL_IE_TIMING_ADVANCE, ta); + + msg->trx = lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + +/* Chapter 8.4.9 */ +int rsl_chan_mode_modify_req(struct gsm_lchan *lchan) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + + u_int8_t chan_nr = lchan2chan_nr(lchan); + struct rsl_ie_chan_mode cm; + + memset(&cm, 0, sizeof(cm)); + + /* FIXME: what to do with data calls ? */ + cm.dtx_dtu = 0x00; + switch (lchan->type) { + /* todo more modes */ + case GSM_LCHAN_TCH_F: + cm.spd_ind = RSL_CMOD_SPD_SPEECH; + cm.chan_rt = RSL_CMOD_CRT_TCH_Bm; + switch(lchan->tch_mode) { + case GSM48_CMODE_SPEECH_V1: + cm.chan_rate = RSL_CMOD_SP_GSM1; + break; + case GSM48_CMODE_SPEECH_EFR: + cm.chan_rate = RSL_CMOD_SP_GSM2; + break; + default: + DEBUGP(DRSL, "Unimplemented channel modification\n"); + return -1; + } + break; + default: + DEBUGP(DRSL, "Unimplemented channel modification\n"); + return -1; + } + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_MODE_MODIFY_REQ); + dh->chan_nr = chan_nr; + + msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(cm), + (u_int8_t *) &cm); +#if 0 + msgb_tlv_put(msg, RSL_IE_ENCR_INFO, 1, + (u_int8_t *) &encr_info); +#endif + + msg->trx = lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + +/* Chapter 9.1.7 of 04.08 */ +int rsl_chan_release(struct gsm_lchan *lchan) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_RF_CHAN_REL); + dh->chan_nr = lchan2chan_nr(lchan); + + msg->lchan = lchan; + msg->trx = lchan->ts->trx; + + DEBUGP(DRSL, "Channel Release CMD channel=%s chan_nr=0x%02x\n", + gsm_ts_name(lchan->ts), dh->chan_nr); + + return abis_rsl_sendmsg(msg); +} + +int rsl_paging_cmd(struct gsm_bts *bts, u_int8_t paging_group, u_int8_t len, + u_int8_t *ms_ident, u_int8_t chan_needed) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_PAGING_CMD); + dh->chan_nr = RSL_CHAN_PCH_AGCH; + + msgb_tv_put(msg, RSL_IE_PAGING_GROUP, paging_group); + msgb_tlv_put(msg, RSL_IE_MS_IDENTITY, len-2, ms_ident+2); + msgb_tv_put(msg, RSL_IE_CHAN_NEEDED, chan_needed); + + msg->trx = bts->c0; + + return abis_rsl_sendmsg(msg); +} + +int rsl_paging_cmd_subscr(struct gsm_bts *bts, u_int8_t chan_need, + struct gsm_subscriber *subscr) +{ +#if 0 + u_int8_t mi[128]; + unsigned int mi_len; + u_int8_t paging_group; +#endif + + return -1; +} + +int imsi_str2bcd(u_int8_t *bcd_out, const char *str_in) +{ + int i, len = strlen(str_in); + + for (i = 0; i < len; i++) { + int num = str_in[i] - 0x30; + if (num < 0 || num > 9) + return -1; + if (i % 2 == 0) + bcd_out[i/2] = num; + else + bcd_out[i/2] |= (num << 4); + } + + return 0; +} + +/* Chapter 8.5.6 */ +int rsl_imm_assign_cmd(struct gsm_bts *bts, u_int8_t len, u_int8_t *val) +{ + struct msgb *msg = rsl_msgb_alloc(); + struct abis_rsl_dchan_hdr *dh; + u_int8_t buf[MACBLOCK_SIZE]; + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_IMMEDIATE_ASSIGN_CMD); + dh->chan_nr = RSL_CHAN_PCH_AGCH; + + switch (bts->type) { + case GSM_BTS_TYPE_BS11: + msgb_tlv_put(msg, RSL_IE_IMM_ASS_INFO, len, val); + break; + default: + /* If phase 2, construct a FULL_IMM_ASS_INFO */ + pad_macblock(buf, val, len); + msgb_tlv_put(msg, RSL_IE_FULL_IMM_ASS_INFO, MACBLOCK_SIZE, buf); + break; + } + + msg->trx = bts->c0; + + return abis_rsl_sendmsg(msg); +} + +/* Send "DATA REQUEST" message with given L3 Info payload */ +/* Chapter 8.3.1 */ +int rsl_data_request(struct msgb *msg, u_int8_t link_id) +{ + u_int8_t l3_len = msg->tail - (u_int8_t *)msgb_l3(msg); + struct abis_rsl_rll_hdr *rh; + + if (msg->lchan == NULL) { + fprintf(stderr, "cannot send DATA REQUEST to unknown lchan\n"); + return -EINVAL; + } + + /* First push the L3 IE tag and length */ + msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len); + + /* Then push the RSL header */ + rh = (struct abis_rsl_rll_hdr *) msgb_push(msg, sizeof(*rh)); + init_llm_hdr(rh, RSL_MT_DATA_REQ); + rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP; + rh->chan_nr = lchan2chan_nr(msg->lchan); + rh->link_id = link_id; + + msg->trx = msg->lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + +/* Chapter 8.4.2: Channel Activate Acknowledge */ +static int rsl_rx_chan_act_ack(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg); + + /* BTS has confirmed channel activation, we now need + * to assign the activated channel to the MS */ + if (rslh->ie_chan != RSL_IE_CHAN_NR) + return -EINVAL; + + return 0; +} + +/* Chapter 8.4.3: Channel Activate NACK */ +static int rsl_rx_chan_act_nack(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); + struct tlv_parsed tp; + + /* BTS has rejected channel activation ?!? */ + if (dh->ie_chan != RSL_IE_CHAN_NR) + return -EINVAL; + + rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh)); + if (TLVP_PRESENT(&tp, RSL_IE_CAUSE)) + DEBUGPC(DRSL, "CAUSE=0x%02x ", *TLVP_VAL(&tp, RSL_IE_CAUSE)); + + return 0; +} + +/* Chapter 8.4.4: Connection Failure Indication */ +static int rsl_rx_conn_fail(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); + struct tlv_parsed tp; + + DEBUGPC(DRSL, "CONNECTION FAIL: "); + print_rsl_cause(dh->data); + + rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh)); + + if (msg->trx->bts->type == GSM_BTS_TYPE_BS11) { + /* FIXME: we have no idea what cause 0x18 is !!! */ + if (TLVP_PRESENT(&tp, RSL_IE_CAUSE) && + TLVP_LEN(&tp, RSL_IE_CAUSE) >= 1 && + *TLVP_VAL(&tp, RSL_IE_CAUSE) == 0x18) { + if (msg->lchan->use_count > 0) { + DEBUGPC(DRSL, "Cause 0x18 IGNORING, lchan in use! (%d times)\n", msg->lchan->use_count); + return 0; + } + } + } + + DEBUGPC(DRSL, "RELEASING.\n"); + + /* FIXME: only free it after channel release ACK */ + return rsl_chan_release(msg->lchan); +} + +static int rsl_rx_meas_res(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); + struct tlv_parsed tp; + + DEBUGPC(DRSL, "MEASUREMENT RESULT "); + rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh)); + + if (TLVP_PRESENT(&tp, RSL_IE_MEAS_RES_NR)) + DEBUGPC(DRSL, "NR=%d ", *TLVP_VAL(&tp, RSL_IE_MEAS_RES_NR)); + if (TLVP_PRESENT(&tp, RSL_IE_UPLINK_MEAS)) { + u_int8_t len = TLVP_LEN(&tp, RSL_IE_UPLINK_MEAS); + const u_int8_t *val = TLVP_VAL(&tp, RSL_IE_UPLINK_MEAS); + if (len >= 3) { + if (val[0] & 0x40) + DEBUGPC(DRSL, "DTXd "); + DEBUGPC(DRSL, "RXL-FULL-up=%d RXL-SUB-up=%d ", + val[0] & 0x3f, val[1] & 0x3f); + DEBUGPC(DRSL, "RXQ-FULL-up=%d RXQ-SUB-up=%d ", + val[2]>>3 & 0x7, val[2] & 0x7); + } + } + if (TLVP_PRESENT(&tp, RSL_IE_BS_POWER)) + DEBUGPC(DRSL, "BS_POWER=%d ", *TLVP_VAL(&tp, RSL_IE_BS_POWER)); + if (TLVP_PRESENT(&tp, RSL_IE_MS_TIMING_OFFSET)) + DEBUGPC(DRSL, "MS_TO=%d ", + *TLVP_VAL(&tp, RSL_IE_MS_TIMING_OFFSET)); + if (TLVP_PRESENT(&tp, RSL_IE_L1_INFO)) + DEBUGPC(DRSL, "L1 "); + if (TLVP_PRESENT(&tp, RSL_IE_L3_INFO)) { + DEBUGPC(DRSL, "L3\n"); + msg->l3h = TLVP_VAL(&tp, RSL_IE_L3_INFO); + return gsm0408_rcvmsg(msg); + } else + DEBUGPC(DRSL, "\n"); + + return 0; +} + +static int abis_rsl_rx_dchan(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg); + int rc = 0; + char *ts_name; + + msg->lchan = lchan_lookup(msg->trx, rslh->chan_nr); + ts_name = gsm_ts_name(msg->lchan->ts); + + DEBUGP(DRSL, "channel=%s chan_nr=0x%02x ", ts_name, rslh->chan_nr); + + switch (rslh->c.msg_type) { + case RSL_MT_CHAN_ACTIV_ACK: + DEBUGPC(DRSL, "CHANNEL ACTIVATE ACK\n"); + rc = rsl_rx_chan_act_ack(msg); + break; + case RSL_MT_CHAN_ACTIV_NACK: + DEBUGPC(DRSL, "CHANNEL ACTIVATE NACK\n"); + rc = rsl_rx_chan_act_nack(msg); + break; + case RSL_MT_CONN_FAIL: + rc = rsl_rx_conn_fail(msg); + break; + case RSL_MT_MEAS_RES: + rc = rsl_rx_meas_res(msg); + break; + case RSL_MT_RF_CHAN_REL_ACK: + DEBUGPC(DRSL, "RF CHANNEL RELEASE ACK\n"); + lchan_free(msg->lchan); + break; + case RSL_MT_MODE_MODIFY_ACK: + DEBUGPC(DRSL, "CHANNEL MODE MODIFY ACK\n"); + break; + case RSL_MT_MODE_MODIFY_NACK: + DEBUGPC(DRSL, "CHANNEL MODE MODIFY NACK\n"); + break; + case RSL_MT_PHY_CONTEXT_CONF: + case RSL_MT_PREPROC_MEAS_RES: + case RSL_MT_TALKER_DET: + case RSL_MT_LISTENER_DET: + case RSL_MT_REMOTE_CODEC_CONF_REP: + case RSL_MT_MR_CODEC_MOD_ACK: + case RSL_MT_MR_CODEC_MOD_NACK: + case RSL_MT_MR_CODEC_MOD_PER: + DEBUGPC(DRSL, "Unimplemented Abis RSL DChan msg 0x%02x\n", + rslh->c.msg_type); + break; + default: + DEBUGPC(DRSL, "unknown Abis RSL DChan msg 0x%02x\n", + rslh->c.msg_type); + return -EINVAL; + } + + return rc; +} + +static int rsl_rx_error_rep(struct msgb *msg) +{ + struct abis_rsl_common_hdr *rslh = msgb_l2(msg); + + DEBUGP(DRSL, "ERROR REPORT "); + print_rsl_cause(rslh->data); + DEBUGPC(DRSL, "\n"); + + return 0; +} + +static int abis_rsl_rx_trx(struct msgb *msg) +{ + struct abis_rsl_common_hdr *rslh = msgb_l2(msg); + int rc = 0; + + switch (rslh->msg_type) { + case RSL_MT_ERROR_REPORT: + rc = rsl_rx_error_rep(msg); + break; + case RSL_MT_RF_RES_IND: + /* interference on idle channels of TRX */ + //DEBUGP(DRSL, "TRX: RF Interference Indication\n"); + break; + case RSL_MT_OVERLOAD: + /* indicate CCCH / ACCH / processor overload */ + DEBUGP(DRSL, "TRX: CCCH/ACCH/CPU Overload\n"); + break; + default: + DEBUGP(DRSL, "Unknown Abis RSL TRX message type 0x%02x\n", + rslh->msg_type); + return -EINVAL; + } + return rc; +} + +/* MS has requested a channel on the RACH */ +static int rsl_rx_chan_rqd(struct msgb *msg) +{ + struct gsm_bts *bts = msg->trx->bts; + struct abis_rsl_dchan_hdr *rqd_hdr = msgb_l2(msg); + struct gsm48_req_ref *rqd_ref; + struct gsm48_imm_ass ia; + enum gsm_chan_t lctype; + enum gsm_chreq_reason_t chreq_reason; + struct gsm_lchan *lchan; + u_int8_t rqd_ta; + int ret; + + u_int16_t arfcn; + u_int8_t ts_number, subch; + + /* parse request reference to be used in immediate assign */ + if (rqd_hdr->data[0] != RSL_IE_REQ_REFERENCE) + return -EINVAL; + + rqd_ref = (struct gsm48_req_ref *) &rqd_hdr->data[1]; + + /* parse access delay and use as TA */ + if (rqd_hdr->data[sizeof(struct gsm48_req_ref)+1] != RSL_IE_ACCESS_DELAY) + return -EINVAL; + rqd_ta = rqd_hdr->data[sizeof(struct gsm48_req_ref)+2]; + + /* determine channel type (SDCCH/TCH_F/TCH_H) based on + * request reference RA */ + lctype = get_ctype_by_chreq(bts, rqd_ref->ra); + chreq_reason = get_reason_by_chreq(bts, rqd_ref->ra); + + /* check availability / allocate channel */ + lchan = lchan_alloc(bts, lctype); + if (!lchan) { + fprintf(stderr, "CHAN RQD: no resources\n"); + /* FIXME: send some kind of reject ?!? */ + return -ENOMEM; + } + + ts_number = lchan->ts->nr; + arfcn = lchan->ts->trx->arfcn; + subch = lchan->nr; + + lchan->ms_power = lchan->bs_power = 0x0f; /* 30dB reduction */ + rsl_chan_activate_lchan(lchan, 0x00, rqd_ta, RSL_CMOD_SPD_SIGN); + + /* create IMMEDIATE ASSIGN 04.08 messge */ + memset(&ia, 0, sizeof(ia)); + ia.l2_plen = 0x2d; + ia.proto_discr = GSM48_PDISC_RR; + ia.msg_type = GSM48_MT_RR_IMM_ASS; + ia.page_mode = GSM48_PM_SAME; + ia.chan_desc.chan_nr = lchan2chan_nr(lchan); + ia.chan_desc.h0.h = 0; + ia.chan_desc.h0.arfcn_high = arfcn >> 8; + ia.chan_desc.h0.arfcn_low = arfcn & 0xff; + ia.chan_desc.h0.tsc = 7; + /* use request reference extracted from CHAN_RQD */ + memcpy(&ia.req_ref, rqd_ref, sizeof(ia.req_ref)); + ia.timing_advance = rqd_ta; + ia.mob_alloc_len = 0; + + DEBUGP(DRSL, "Activating ARFCN(%u) TS(%u) SS(%u) lctype %s " + "chan_nr=0x%02x r=%s ra=0x%02x\n", + arfcn, ts_number, subch, gsm_lchan_name(lchan->type), + ia.chan_desc.chan_nr, gsm_chreq_name(chreq_reason), + rqd_ref->ra); + + /* FIXME: Start timer T3101 to wait for GSM48_MT_RR_PAG_RESP */ + + /* send IMMEDIATE ASSIGN CMD on RSL to BTS (to send on CCCH to MS) */ + ret = rsl_imm_assign_cmd(bts, sizeof(ia), (u_int8_t *) &ia); + + return ret; +} + +/* MS has requested a channel on the RACH */ +static int rsl_rx_ccch_load(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg); + u_int16_t pg_buf_space; + u_int16_t rach_slot_count = -1; + u_int16_t rach_busy_count = -1; + u_int16_t rach_access_count = -1; + + switch (rslh->data[0]) { + case RSL_IE_PAGING_LOAD: + pg_buf_space = rslh->data[1] << 8 | rslh->data[2]; + paging_update_buffer_space(msg->trx->bts, pg_buf_space); + break; + case RSL_IE_RACH_LOAD: + if (msg->data_len >= 7) { + rach_slot_count = rslh->data[2] << 8 | rslh->data[3]; + rach_busy_count = rslh->data[4] << 8 | rslh->data[5]; + rach_access_count = rslh->data[6] << 8 | rslh->data[7]; + } + break; + default: + break; + } + + return 0; +} + +static int abis_rsl_rx_cchan(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg); + int rc = 0; + + msg->lchan = lchan_lookup(msg->trx, rslh->chan_nr); + + switch (rslh->c.msg_type) { + case RSL_MT_CHAN_RQD: + /* MS has requested a channel on the RACH */ + rc = rsl_rx_chan_rqd(msg); + break; + case RSL_MT_CCCH_LOAD_IND: + /* current load on the CCCH */ + rc = rsl_rx_ccch_load(msg); + break; + case RSL_MT_DELETE_IND: + /* CCCH overloaded, IMM_ASSIGN was dropped */ + case RSL_MT_CBCH_LOAD_IND: + /* current load on the CBCH */ + fprintf(stderr, "Unimplemented Abis RSL TRX message type " + "0x%02x\n", rslh->c.msg_type); + break; + default: + fprintf(stderr, "Unknown Abis RSL TRX message type 0x%02x\n", + rslh->c.msg_type); + return -EINVAL; + } + + return rc; +} + +static int rsl_rx_rll_err_ind(struct msgb *msg) +{ + struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); + u_int8_t *rlm_cause = rllh->data; + + DEBUGPC(DRLL, "cause=0x%02x", rlm_cause[1]); + + return 0; +} + +/* ESTABLISH INDICATION, LOCATION AREA UPDATE REQUEST + 0x02, 0x06, + 0x01, 0x20, + 0x02, 0x00, + 0x0b, 0x00, 0x0f, 0x05, 0x08, ... */ + +static int abis_rsl_rx_rll(struct msgb *msg) +{ + struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); + int rc = 0; + char *ts_name; + + msg->lchan = lchan_lookup(msg->trx, rllh->chan_nr); + ts_name = gsm_ts_name(msg->lchan->ts); + DEBUGP(DRLL, "channel=%s chan_nr=0x%02x ", ts_name, rllh->chan_nr); + + switch (rllh->c.msg_type) { + case RSL_MT_DATA_IND: + DEBUGPC(DRLL, "DATA INDICATION\n"); + if (msgb_l2len(msg) > + sizeof(struct abis_rsl_common_hdr) + sizeof(*rllh) && + rllh->data[0] == RSL_IE_L3_INFO) { + msg->l3h = &rllh->data[3]; + return gsm0408_rcvmsg(msg); + } + break; + case RSL_MT_EST_IND: + DEBUGPC(DRLL, "ESTABLISH INDICATION\n"); + if (msgb_l2len(msg) > + sizeof(struct abis_rsl_common_hdr) + sizeof(*rllh) && + rllh->data[0] == RSL_IE_L3_INFO) { + msg->l3h = &rllh->data[3]; + return gsm0408_rcvmsg(msg); + } + break; + case RSL_MT_REL_IND: + DEBUGPC(DRLL, "RELEASE INDICATION "); + break; + case RSL_MT_REL_CONF: + DEBUGPC(DRLL, "RELEASE CONFIRMATION "); + break; + case RSL_MT_ERROR_IND: + DEBUGPC(DRLL, "ERROR INDICATION "); + rc = rsl_rx_rll_err_ind(msg); + break; + case RSL_MT_UNIT_DATA_IND: + DEBUGPC(DRLL, "unimplemented Abis RLL message type 0x%02x ", + rllh->c.msg_type); + break; + default: + DEBUGPC(DRLL, "unknown Abis RLL message type 0x%02x ", + rllh->c.msg_type); + } + DEBUGPC(DRLL, "\n"); + return rc; +} + +/* ip.access specific RSL extensions */ +int rsl_ipacc_bind(struct gsm_lchan *lchan) +{ + struct msgb *msg = rsl_msgb_alloc(); + struct abis_rsl_dchan_hdr *dh; + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_IPAC_BIND); + dh->c.msg_discr = ABIS_RSL_MDISC_IPACCESS; + dh->chan_nr = lchan2chan_nr(lchan); + + msg->trx = lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + +int rsl_ipacc_connect(struct gsm_lchan *lchan, u_int32_t ip, u_int16_t port, u_int16_t f8, u_int8_t fc) +{ + struct msgb *msg = rsl_msgb_alloc(); + struct abis_rsl_dchan_hdr *dh; + u_int8_t *att_f8, *att_ip, *att_port; + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_IPAC_CONNECT); + dh->c.msg_discr = ABIS_RSL_MDISC_IPACCESS; + dh->chan_nr = lchan2chan_nr(lchan); + + att_f8 = msgb_put(msg, sizeof(f8)+1); + att_f8[0] = 0xf8; + att_f8[1] = f8 >> 8; + att_f8[2] = f8 & 0xff; + + att_ip = msgb_put(msg, sizeof(ip)+1); + att_ip[0] = RSL_IE_IPAC_REMOTE_IP; + att_ip[1] = ip >> 24; + att_ip[2] = ip >> 16; + att_ip[3] = ip >> 8; + att_ip[4] = ip & 0xff; + //att_ip[4] = 11; + + att_port = msgb_put(msg, sizeof(port)+1); + att_port[0] = RSL_IE_IPAC_REMOTE_PORT; + att_port[1] = port >> 8; + att_port[2] = port & 0xff; + + msgb_tv_put(msg, 0xf4, 1); /* F4 01 */ + msgb_tv_put(msg, 0xfc, fc); /* FC 7F */ + msg->trx = lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + +static int abis_rsl_rx_ipacc_bindack(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); + struct tlv_parsed tv; + struct gsm_bts_trx_ts *ts = msg->lchan->ts; + struct in_addr ip; + u_int16_t port, attr_f8; + + /* the BTS has acknowledged a local bind, it now tells us the IP + * address and port number to which it has bound the given logical + * channel */ + + rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh)); + if (!TLVP_PRESENT(&tv, RSL_IE_IPAC_LOCAL_PORT) || + !TLVP_PRESENT(&tv, RSL_IE_IPAC_LOCAL_IP) || + !TLVP_PRESENT(&tv, 0xfc) || + !TLVP_PRESENT(&tv, 0xf8)) { + DEBUGPC(DRSL, "mandatory IE missing"); + return -EINVAL; + } + ip.s_addr = *((u_int32_t *) TLVP_VAL(&tv, RSL_IE_IPAC_LOCAL_IP)); + port = *((u_int16_t *) TLVP_VAL(&tv, RSL_IE_IPAC_LOCAL_PORT)); + attr_f8 = *((u_int16_t *) TLVP_VAL(&tv, 0xf8)); + + DEBUGPC(DRSL, "IP=%s PORT=%d FC=%d F8=%d", + inet_ntoa(ip), ntohs(port), *TLVP_VAL(&tv, 0xfc), + ntohs(attr_f8)); + + /* update our local information about this TS */ + ts->abis_ip.bound_ip = ntohl(ip.s_addr); + ts->abis_ip.bound_port = ntohs(port); + ts->abis_ip.attr_f8 = ntohs(attr_f8); + ts->abis_ip.attr_fc = *TLVP_VAL(&tv, 0xfc); + + dispatch_signal(SS_ABISIP, S_ABISIP_BIND_ACK, msg->lchan); + + return 0; +} + +static int abis_rsl_rx_ipacc_disc_ind(struct msgb *msg) +{ + struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); + struct tlv_parsed tv; + + rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh)); + if (!TLVP_PRESENT(&tv, RSL_IE_CAUSE)) { + DEBUGPC(DRSL, "mandatory IE missing! "); + return -EINVAL; + } + + DEBUGPC(DRSL, "cause=0x%02x ", *TLVP_VAL(&tv, RSL_IE_CAUSE)); + + return 0; +} + +static int abis_rsl_rx_ipacc(struct msgb *msg) +{ + struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); + int rc = 0; + + msg->lchan = lchan_lookup(msg->trx, rllh->chan_nr); + DEBUGP(DRSL, "channel=%s chan_nr=0x%02x ", + gsm_ts_name(msg->lchan->ts), rllh->chan_nr); + + switch (rllh->c.msg_type) { + case RSL_MT_IPAC_BIND_ACK: + DEBUGPC(DRSL, "IPAC_BIND_ACK "); + rc = abis_rsl_rx_ipacc_bindack(msg); + break; + case RSL_MT_IPAC_BIND_NACK: + /* somehow the BTS was unable to bind the lchan to its local + * port?!? */ + DEBUGPC(DRSL, "IPAC_BIND_NACK "); + break; + case RSL_MT_IPAC_CONNECT_ACK: + /* the BTS tells us that a connect operation was successful */ + DEBUGPC(DRSL, "IPAC_CONNECT_ACK "); + break; + case RSL_MT_IPAC_CONNECT_NACK: + /* somehow the BTS was unable to connect the lchan to a remote + * port */ + DEBUGPC(DRSL, "IPAC_CONNECT_NACK "); + break; + case RSL_MT_IPAC_DISCONNECT_IND: + DEBUGPC(DRSL, "IPAC_DISCONNECT_IND "); + rc = abis_rsl_rx_ipacc_disc_ind(msg); + break; + default: + DEBUGPC(DRSL, "Unknown ip.access msg_type 0x%02x", rllh->c.msg_type); + break; + } + DEBUGPC(DRSL, "\n"); + + return rc; +} + + +/* Entry-point where L2 RSL from BTS enters */ +int abis_rsl_rcvmsg(struct msgb *msg) +{ + struct abis_rsl_common_hdr *rslh = msgb_l2(msg) ; + int rc = 0; + + switch (rslh->msg_discr & 0xfe) { + case ABIS_RSL_MDISC_RLL: + rc = abis_rsl_rx_rll(msg); + break; + case ABIS_RSL_MDISC_DED_CHAN: + rc = abis_rsl_rx_dchan(msg); + break; + case ABIS_RSL_MDISC_COM_CHAN: + rc = abis_rsl_rx_cchan(msg); + break; + case ABIS_RSL_MDISC_TRX: + rc = abis_rsl_rx_trx(msg); + break; + case ABIS_RSL_MDISC_LOC: + fprintf(stderr, "unimplemented RSL msg disc 0x%02x\n", + rslh->msg_discr); + break; + case ABIS_RSL_MDISC_IPACCESS: + rc = abis_rsl_rx_ipacc(msg); + break; + default: + fprintf(stderr, "unknown RSL message discriminator 0x%02x\n", + rslh->msg_discr); + return -EINVAL; + } + msgb_free(msg); + return rc; +} + + +/* Section 3.3.2.3 . I think this looks like a table */ +int rsl_ccch_conf_to_bs_cc_chans(int ccch_conf) +{ + switch (ccch_conf) { + case RSL_BCCH_CCCH_CONF_1_NC: + return 1; + case RSL_BCCH_CCCH_CONF_1_C: + return 1; + case RSL_BCCH_CCCH_CONF_2_NC: + return 2; + case RSL_BCCH_CCCH_CONF_3_NC: + return 3; + case RSL_BCCH_CCCH_CONF_4_NC: + return 4; + default: + return -1; + } +} + +int rsl_ccch_conf_to_bs_ccch_sdcch_comb(int ccch_conf) +{ + switch (ccch_conf) { + case RSL_BCCH_CCCH_CONF_1_NC: + return 0; + case RSL_BCCH_CCCH_CONF_1_C: + return 1; + case RSL_BCCH_CCCH_CONF_2_NC: + return 0; + case RSL_BCCH_CCCH_CONF_3_NC: + return 0; + case RSL_BCCH_CCCH_CONF_4_NC: + return 0; + default: + return -1; + } +} + +/* From Table 10.5.33 of GSM 04.08 */ +int rsl_number_of_paging_subchannels(struct gsm_bts *bts) +{ + if (bts->chan_desc.ccch_conf == RSL_BCCH_CCCH_CONF_1_C) { + return MAX(1, (3 - bts->chan_desc.bs_ag_blks_res)) + * (bts->chan_desc.bs_pa_mfrms + 2); + } else { + return (9 - bts->chan_desc.bs_ag_blks_res) + * (bts->chan_desc.bs_pa_mfrms + 2); + } +} |