| /* 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) 2008-2010 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 <osmocore/gsm_utils.h> |
| #include <openbsc/abis_rsl.h> |
| #include <openbsc/chan_alloc.h> |
| #include <openbsc/bsc_rll.h> |
| #include <openbsc/debug.h> |
| #include <osmocore/tlv.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/signal.h> |
| #include <openbsc/meas_rep.h> |
| #include <openbsc/rtp_proxy.h> |
| #include <osmocore/rsl.h> |
| |
| #define RSL_ALLOC_SIZE 1024 |
| #define RSL_ALLOC_HEADROOM 128 |
| |
| #define MAX(a, b) (a) >= (b) ? (a) : (b) |
| |
| 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; |
| } |
| |
| /* 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 && |
| ts->pchan != GSM_PCHAN_PDCH && |
| ts->pchan != GSM_PCHAN_TCH_F_PDCH) |
| LOGP(DRSL, LOGL_ERROR, "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) |
| LOGP(DRSL, LOGL_ERROR, "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) |
| LOGP(DRSL, LOGL_ERROR, "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) |
| LOGP(DRSL, LOGL_ERROR, "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) |
| LOGP(DRSL, LOGL_ERROR, "chan_nr=0x%02x but pchan=%u\n", |
| chan_nr, ts->pchan); |
| /* FIXME: we should not return first sdcch4 !!! */ |
| } else { |
| LOGP(DRSL, LOGL_ERROR, "unknown chan_nr=0x%02x\n", chan_nr); |
| return NULL; |
| } |
| |
| lchan = &ts->lchan[lch_idx]; |
| log_set_context(BSC_CTX_LCHAN, lchan); |
| log_set_context(BSC_CTX_SUBSCR, lchan->conn.subscr); |
| |
| return lchan; |
| } |
| |
| /* See Table 10.5.25 of GSM04.08 */ |
| u_int8_t lchan2chan_nr(const 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: |
| case GSM_PCHAN_PDCH: |
| case GSM_PCHAN_TCH_F_PDCH: |
| 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, |
| "RSL"); |
| } |
| |
| #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); |
| } |
| |
| /* Chapter 9.3.7: Encryption Information */ |
| static int build_encr_info(u_int8_t *out, struct gsm_lchan *lchan) |
| { |
| *out++ = lchan->encr.alg_id & 0xff; |
| if (lchan->encr.key_len) |
| memcpy(out, lchan->encr.key, lchan->encr.key_len); |
| return lchan->encr.key_len + 1; |
| } |
| |
| static void print_rsl_cause(int lvl, const u_int8_t *cause_v, u_int8_t cause_len) |
| { |
| int i; |
| |
| LOGPC(DRSL, lvl, "CAUSE=0x%02x(%s) ", |
| cause_v[0], rsl_err_name(cause_v[0])); |
| for (i = 1; i < cause_len-1; i++) |
| LOGPC(DRSL, lvl, "%02x ", cause_v[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); |
| } |
| |
| int rsl_chan_bs_power_ctrl(struct gsm_lchan *lchan, unsigned int fpc, int db) |
| { |
| struct abis_rsl_dchan_hdr *dh; |
| struct msgb *msg; |
| u_int8_t chan_nr = lchan2chan_nr(lchan); |
| |
| db = abs(db); |
| if (db > 30) |
| return -EINVAL; |
| |
| msg = rsl_msgb_alloc(); |
| |
| lchan->bs_power = db/2; |
| if (fpc) |
| lchan->bs_power |= 0x10; |
| |
| dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| init_dchan_hdr(dh, RSL_MT_BS_POWER_CONTROL); |
| dh->chan_nr = chan_nr; |
| |
| msgb_tv_put(msg, RSL_IE_BS_POWER, lchan->bs_power); |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| int rsl_chan_ms_power_ctrl(struct gsm_lchan *lchan, unsigned int fpc, int dbm) |
| { |
| struct abis_rsl_dchan_hdr *dh; |
| struct msgb *msg; |
| u_int8_t chan_nr = lchan2chan_nr(lchan); |
| int ctl_lvl; |
| |
| ctl_lvl = ms_pwr_ctl_lvl(lchan->ts->trx->bts->band, dbm); |
| if (ctl_lvl < 0) |
| return ctl_lvl; |
| |
| msg = rsl_msgb_alloc(); |
| |
| lchan->ms_power = ctl_lvl; |
| |
| if (fpc) |
| lchan->ms_power |= 0x20; |
| |
| dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| init_dchan_hdr(dh, RSL_MT_MS_POWER_CONTROL); |
| dh->chan_nr = chan_nr; |
| |
| msgb_tv_put(msg, RSL_IE_MS_POWER, lchan->ms_power); |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| static int channel_mode_from_lchan(struct rsl_ie_chan_mode *cm, |
| struct gsm_lchan *lchan) |
| { |
| memset(cm, 0, sizeof(cm)); |
| |
| /* FIXME: what to do with data calls ? */ |
| cm->dtx_dtu = 0x00; |
| |
| /* set TCH Speech/Data */ |
| cm->spd_ind = lchan->rsl_cmode; |
| |
| if (lchan->rsl_cmode == RSL_CMOD_SPD_SIGN && |
| lchan->tch_mode != GSM48_CMODE_SIGN) |
| LOGP(DRSL, LOGL_ERROR, "unsupported: rsl_mode == signalling, " |
| "but tch_mode != signalling\n"); |
| |
| switch (lchan->type) { |
| case GSM_LCHAN_SDCCH: |
| cm->chan_rt = RSL_CMOD_CRT_SDCCH; |
| break; |
| case GSM_LCHAN_TCH_F: |
| cm->chan_rt = RSL_CMOD_CRT_TCH_Bm; |
| break; |
| case GSM_LCHAN_TCH_H: |
| cm->chan_rt = RSL_CMOD_CRT_TCH_Lm; |
| break; |
| case GSM_LCHAN_NONE: |
| case GSM_LCHAN_UNKNOWN: |
| default: |
| return -EINVAL; |
| } |
| |
| switch (lchan->tch_mode) { |
| case GSM48_CMODE_SIGN: |
| cm->chan_rate = 0; |
| break; |
| 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; |
| case GSM48_CMODE_SPEECH_AMR: |
| cm->chan_rate = RSL_CMOD_SP_GSM3; |
| break; |
| case GSM48_CMODE_DATA_14k5: |
| cm->chan_rate = RSL_CMOD_SP_NT_14k5; |
| break; |
| case GSM48_CMODE_DATA_12k0: |
| cm->chan_rate = RSL_CMOD_SP_NT_12k0; |
| break; |
| case GSM48_CMODE_DATA_6k0: |
| cm->chan_rate = RSL_CMOD_SP_NT_6k0; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* 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 ho_ref) |
| { |
| struct abis_rsl_dchan_hdr *dh; |
| struct msgb *msg; |
| int rc; |
| |
| 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; |
| |
| rc = channel_mode_from_lchan(&cm, lchan); |
| if (rc < 0) |
| return rc; |
| |
| 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; |
| |
| 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); |
| msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(cm), |
| (u_int8_t *) &cm); |
| /* For compatibility with Phase 1 */ |
| msgb_tlv_put(msg, RSL_IE_CHAN_IDENT, 4, |
| (u_int8_t *) &ci); |
| |
| if (lchan->encr.alg_id > RSL_ENC_ALG_A5(0)) { |
| u_int8_t encr_info[MAX_A5_KEY_LEN+2]; |
| rc = build_encr_info(encr_info, lchan); |
| if (rc > 0) |
| msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info); |
| } |
| |
| switch (act_type) { |
| case RSL_ACT_INTER_ASYNC: |
| case RSL_ACT_INTER_SYNC: |
| msgb_tv_put(msg, RSL_IE_HANDO_REF, ho_ref); |
| break; |
| default: |
| break; |
| } |
| |
| 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); |
| |
| if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) |
| msgb_tlv_put(msg, RSL_IE_MR_CONFIG, sizeof(lchan->mr_conf), |
| (u_int8_t *) &lchan->mr_conf); |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* Chapter 8.4.9: Modify channel mode on BTS side */ |
| int rsl_chan_mode_modify_req(struct gsm_lchan *lchan) |
| { |
| struct abis_rsl_dchan_hdr *dh; |
| struct msgb *msg; |
| int rc; |
| |
| u_int8_t chan_nr = lchan2chan_nr(lchan); |
| struct rsl_ie_chan_mode cm; |
| |
| rc = channel_mode_from_lchan(&cm, lchan); |
| if (rc < 0) |
| return rc; |
| |
| msg = rsl_msgb_alloc(); |
| 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 (lchan->encr.alg_id > RSL_ENC_ALG_A5(0)) { |
| u_int8_t encr_info[MAX_A5_KEY_LEN+2]; |
| rc = build_encr_info(encr_info, lchan); |
| if (rc > 0) |
| msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info); |
| } |
| |
| if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) { |
| msgb_tlv_put(msg, RSL_IE_MR_CONFIG, sizeof(lchan->mr_conf), |
| (u_int8_t *) &lchan->mr_conf); |
| } |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* Chapter 8.4.6: Send the encryption command with given L3 info */ |
| int rsl_encryption_cmd(struct msgb *msg) |
| { |
| struct abis_rsl_dchan_hdr *dh; |
| struct gsm_lchan *lchan = msg->lchan; |
| u_int8_t chan_nr = lchan2chan_nr(lchan); |
| u_int8_t encr_info[MAX_A5_KEY_LEN+2]; |
| u_int8_t l3_len = msg->len; |
| int rc; |
| |
| /* First push the L3 IE tag and length */ |
| msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len); |
| |
| /* then the link identifier (SAPI0, main sign link) */ |
| msgb_tv_push(msg, RSL_IE_LINK_IDENT, 0); |
| |
| /* then encryption information */ |
| rc = build_encr_info(encr_info, lchan); |
| if (rc <= 0) |
| return rc; |
| msgb_tlv_push(msg, RSL_IE_ENCR_INFO, rc, encr_info); |
| |
| /* and finally the DCHAN header */ |
| dh = (struct abis_rsl_dchan_hdr *) msgb_push(msg, sizeof(*dh)); |
| init_dchan_hdr(dh, RSL_MT_ENCR_CMD); |
| dh->chan_nr = chan_nr; |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* Chapter 8.4.5 / 4.6: Deactivate the SACCH after 04.08 RR CHAN RELEASE */ |
| int rsl_deact_sacch(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_DEACTIVATE_SACCH); |
| dh->chan_nr = lchan2chan_nr(lchan); |
| |
| msg->lchan = lchan; |
| msg->trx = lchan->ts->trx; |
| |
| DEBUGP(DRSL, "%s DEACTivate SACCH CMD\n", gsm_lchan_name(lchan)); |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* Chapter 8.4.14 / 4.7: Tell BTS to release the radio channel */ |
| int rsl_rf_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, "%s RF Channel Release CMD\n", gsm_lchan_name(lchan)); |
| |
| /* BTS will respond by RF CHAN REL ACK */ |
| 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 Siemens specific MS RF Power Capability Indication */ |
| int rsl_siemens_mrpci(struct gsm_lchan *lchan, struct rsl_mrpci *mrpci) |
| { |
| 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_SIEMENS_MRPCI); |
| dh->c.msg_discr = ABIS_RSL_MDISC_DED_CHAN; |
| dh->chan_nr = lchan2chan_nr(lchan); |
| msgb_tv_put(msg, RSL_IE_SIEMENS_MRPCI, *(u_int8_t *)mrpci); |
| |
| DEBUGP(DRSL, "%s TX Siemens MRPCI 0x%02x\n", |
| gsm_lchan_name(lchan), *(u_int8_t *)mrpci); |
| |
| msg->trx = lchan->ts->trx; |
| |
| 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) |
| { |
| if (msg->lchan == NULL) { |
| LOGP(DRSL, LOGL_ERROR, "cannot send DATA REQUEST to unknown lchan\n"); |
| return -EINVAL; |
| } |
| |
| rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, lchan2chan_nr(msg->lchan), |
| link_id, 1); |
| |
| msg->trx = msg->lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* Send "ESTABLISH REQUEST" message with given L3 Info payload */ |
| /* Chapter 8.3.1 */ |
| int rsl_establish_request(struct gsm_lchan *lchan, u_int8_t link_id) |
| { |
| struct msgb *msg; |
| |
| msg = rsl_rll_simple(RSL_MT_EST_REQ, lchan2chan_nr(lchan), |
| link_id, 0); |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* Chapter 8.3.7 Request the release of multiframe mode of RLL connection. |
| This is what higher layers should call. The BTS then responds with |
| RELEASE CONFIRM, which we in turn use to trigger RSL CHANNEL RELEASE, |
| which in turn is acknowledged by RSL CHANNEL RELEASE ACK, which calls |
| lchan_free() */ |
| int rsl_release_request(struct gsm_lchan *lchan, u_int8_t link_id) |
| { |
| |
| struct msgb *msg; |
| |
| msg = rsl_rll_simple(RSL_MT_REL_REQ, lchan2chan_nr(lchan), |
| link_id, 0); |
| msgb_tv_put(msg, RSL_IE_RELEASE_MODE, 0); /* normal release */ |
| |
| /* FIXME: start some timer in case we don't receive a REL ACK ? */ |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| int rsl_lchan_set_state(struct gsm_lchan *lchan, int state) |
| { |
| lchan->state = state; |
| return 0; |
| } |
| |
| /* 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; |
| |
| if (msg->lchan->state != LCHAN_S_ACT_REQ) |
| LOGP(DRSL, LOGL_NOTICE, "%s CHAN ACT ACK, but state %s\n", |
| gsm_lchan_name(msg->lchan), |
| gsm_lchans_name(msg->lchan->state)); |
| rsl_lchan_set_state(msg->lchan, LCHAN_S_ACTIVE); |
| |
| dispatch_signal(SS_LCHAN, S_LCHAN_ACTIVATE_ACK, msg->lchan); |
| |
| 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; |
| |
| LOGP(DRSL, LOGL_ERROR, "%s CHANNEL ACTIVATE NACK", |
| gsm_lchan_name(msg->lchan)); |
| |
| /* 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)) { |
| const u_int8_t *cause = TLVP_VAL(&tp, RSL_IE_CAUSE); |
| print_rsl_cause(LOGL_ERROR, cause, |
| TLVP_LEN(&tp, RSL_IE_CAUSE)); |
| if (*cause != RSL_ERR_RCH_ALR_ACTV_ALLOC) |
| rsl_lchan_set_state(msg->lchan, LCHAN_S_NONE); |
| } else |
| rsl_lchan_set_state(msg->lchan, LCHAN_S_NONE); |
| |
| LOGPC(DRSL, LOGL_ERROR, "\n"); |
| |
| dispatch_signal(SS_LCHAN, S_LCHAN_ACTIVATE_NACK, msg->lchan); |
| |
| lchan_free(msg->lchan); |
| 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; |
| |
| /* FIXME: print which channel */ |
| LOGP(DRSL, LOGL_NOTICE, "%s CONNECTION FAIL: RELEASING ", |
| gsm_lchan_name(msg->lchan)); |
| |
| rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh)); |
| |
| if (TLVP_PRESENT(&tp, RSL_IE_CAUSE)) |
| print_rsl_cause(LOGL_NOTICE, TLVP_VAL(&tp, RSL_IE_CAUSE), |
| TLVP_LEN(&tp, RSL_IE_CAUSE)); |
| |
| LOGPC(DRSL, LOGL_NOTICE, "\n"); |
| /* FIXME: only free it after channel release ACK */ |
| counter_inc(msg->lchan->ts->trx->bts->network->stats.chan.rf_fail); |
| return rsl_rf_chan_release(msg->lchan); |
| } |
| |
| static void print_meas_rep_uni(struct gsm_meas_rep_unidir *mru, |
| const char *prefix) |
| { |
| DEBUGPC(DMEAS, "RXL-FULL-%s=%3ddBm RXL-SUB-%s=%3ddBm ", |
| prefix, rxlev2dbm(mru->full.rx_lev), |
| prefix, rxlev2dbm(mru->sub.rx_lev)); |
| DEBUGPC(DMEAS, "RXQ-FULL-%s=%d RXQ-SUB-%s=%d ", |
| prefix, mru->full.rx_qual, prefix, mru->sub.rx_qual); |
| } |
| |
| static void print_meas_rep(struct gsm_meas_rep *mr) |
| { |
| int i; |
| |
| DEBUGP(DMEAS, "MEASUREMENT RESULT NR=%d ", mr->nr); |
| |
| if (mr->flags & MEAS_REP_F_DL_DTX) |
| DEBUGPC(DMEAS, "DTXd "); |
| |
| print_meas_rep_uni(&mr->ul, "ul"); |
| DEBUGPC(DMEAS, "BS_POWER=%d ", mr->bs_power); |
| if (mr->flags & MEAS_REP_F_MS_TO) |
| DEBUGPC(DMEAS, "MS_TO=%d ", mr->ms_timing_offset); |
| |
| if (mr->flags & MEAS_REP_F_MS_L1) { |
| DEBUGPC(DMEAS, "L1_MS_PWR=%3ddBm ", mr->ms_l1.pwr); |
| DEBUGPC(DMEAS, "L1_FPC=%u ", |
| mr->flags & MEAS_REP_F_FPC ? 1 : 0); |
| DEBUGPC(DMEAS, "L1_TA=%u ", mr->ms_l1.ta); |
| } |
| |
| if (mr->flags & MEAS_REP_F_UL_DTX) |
| DEBUGPC(DMEAS, "DTXu "); |
| if (mr->flags & MEAS_REP_F_BA1) |
| DEBUGPC(DMEAS, "BA1 "); |
| if (!(mr->flags & MEAS_REP_F_DL_VALID)) |
| DEBUGPC(DMEAS, "NOT VALID "); |
| else |
| print_meas_rep_uni(&mr->dl, "dl"); |
| |
| DEBUGPC(DMEAS, "NUM_NEIGH=%u\n", mr->num_cell); |
| if (mr->num_cell == 7) |
| return; |
| for (i = 0; i < mr->num_cell; i++) { |
| struct gsm_meas_rep_cell *mrc = &mr->cell[i]; |
| DEBUGP(DMEAS, "IDX=%u ARFCN=%u BSIC=%u => %d dBm\n", |
| mrc->neigh_idx, mrc->arfcn, mrc->bsic, rxlev2dbm(mrc->rxlev)); |
| } |
| } |
| |
| static int rsl_rx_meas_res(struct msgb *msg) |
| { |
| struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); |
| struct tlv_parsed tp; |
| struct gsm_meas_rep *mr = lchan_next_meas_rep(msg->lchan); |
| u_int8_t len; |
| const u_int8_t *val; |
| int rc; |
| |
| /* check if this channel is actually active */ |
| /* FIXME: maybe this check should be way more generic/centralized */ |
| if (msg->lchan->state != LCHAN_S_ACTIVE) { |
| LOGP(DRSL, LOGL_NOTICE, "%s: MEAS RES for inactive channel\n", |
| gsm_lchan_name(msg->lchan)); |
| return 0; |
| } |
| |
| memset(mr, 0, sizeof(*mr)); |
| mr->lchan = msg->lchan; |
| |
| rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh)); |
| |
| if (!TLVP_PRESENT(&tp, RSL_IE_MEAS_RES_NR) || |
| !TLVP_PRESENT(&tp, RSL_IE_UPLINK_MEAS) || |
| !TLVP_PRESENT(&tp, RSL_IE_BS_POWER)) |
| return -EIO; |
| |
| /* Mandatory Parts */ |
| mr->nr = *TLVP_VAL(&tp, RSL_IE_MEAS_RES_NR); |
| |
| len = TLVP_LEN(&tp, RSL_IE_UPLINK_MEAS); |
| val = TLVP_VAL(&tp, RSL_IE_UPLINK_MEAS); |
| if (len >= 3) { |
| if (val[0] & 0x40) |
| mr->flags |= MEAS_REP_F_DL_DTX; |
| mr->ul.full.rx_lev = val[0] & 0x3f; |
| mr->ul.sub.rx_lev = val[1] & 0x3f; |
| mr->ul.full.rx_qual = val[2]>>3 & 0x7; |
| mr->ul.sub.rx_qual = val[2] & 0x7; |
| } |
| |
| mr->bs_power = *TLVP_VAL(&tp, RSL_IE_BS_POWER); |
| |
| /* Optional Parts */ |
| if (TLVP_PRESENT(&tp, RSL_IE_MS_TIMING_OFFSET)) |
| mr->ms_timing_offset = |
| *TLVP_VAL(&tp, RSL_IE_MS_TIMING_OFFSET); |
| |
| if (TLVP_PRESENT(&tp, RSL_IE_L1_INFO)) { |
| val = TLVP_VAL(&tp, RSL_IE_L1_INFO); |
| mr->flags |= MEAS_REP_F_MS_L1; |
| mr->ms_l1.pwr = ms_pwr_dbm(msg->trx->bts->band, val[0] >> 3); |
| if (val[0] & 0x04) |
| mr->flags |= MEAS_REP_F_FPC; |
| mr->ms_l1.ta = val[1]; |
| } |
| if (TLVP_PRESENT(&tp, RSL_IE_L3_INFO)) { |
| msg->l3h = (u_int8_t *) TLVP_VAL(&tp, RSL_IE_L3_INFO); |
| rc = gsm48_parse_meas_rep(mr, msg); |
| if (rc < 0) |
| return rc; |
| } |
| |
| print_meas_rep(mr); |
| |
| dispatch_signal(SS_LCHAN, S_LCHAN_MEAS_REP, mr); |
| |
| return 0; |
| } |
| |
| /* Chapter 8.4.7 */ |
| static int rsl_rx_hando_det(struct msgb *msg) |
| { |
| struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); |
| struct tlv_parsed tp; |
| |
| DEBUGP(DRSL, "%s HANDOVER DETECT ", gsm_lchan_name(msg->lchan)); |
| |
| rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh)); |
| |
| if (TLVP_PRESENT(&tp, RSL_IE_ACCESS_DELAY)) |
| DEBUGPC(DRSL, "access delay = %u\n", |
| *TLVP_VAL(&tp, RSL_IE_ACCESS_DELAY)); |
| else |
| DEBUGPC(DRSL, "\n"); |
| |
| dispatch_signal(SS_LCHAN, S_LCHAN_HANDOVER_DETECT, msg->lchan); |
| |
| 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_lchan_name(msg->lchan); |
| |
| switch (rslh->c.msg_type) { |
| case RSL_MT_CHAN_ACTIV_ACK: |
| DEBUGP(DRSL, "%s CHANNEL ACTIVATE ACK\n", ts_name); |
| rc = rsl_rx_chan_act_ack(msg); |
| break; |
| case RSL_MT_CHAN_ACTIV_NACK: |
| 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_HANDO_DET: |
| rc = rsl_rx_hando_det(msg); |
| break; |
| case RSL_MT_RF_CHAN_REL_ACK: |
| DEBUGP(DRSL, "%s RF CHANNEL RELEASE ACK\n", ts_name); |
| if (msg->lchan->state != LCHAN_S_REL_REQ) |
| LOGP(DRSL, LOGL_NOTICE, "%s CHAN REL ACK but state %s\n", |
| gsm_lchan_name(msg->lchan), |
| gsm_lchans_name(msg->lchan->state)); |
| rsl_lchan_set_state(msg->lchan, LCHAN_S_NONE); |
| lchan_free(msg->lchan); |
| break; |
| case RSL_MT_MODE_MODIFY_ACK: |
| DEBUGP(DRSL, "%s CHANNEL MODE MODIFY ACK\n", ts_name); |
| break; |
| case RSL_MT_MODE_MODIFY_NACK: |
| LOGP(DRSL, LOGL_ERROR, "%s CHANNEL MODE MODIFY NACK\n", ts_name); |
| break; |
| case RSL_MT_IPAC_PDCH_ACT_ACK: |
| DEBUGPC(DRSL, "%s IPAC PDCH ACT ACK\n", ts_name); |
| msg->lchan->ts->flags |= TS_F_PDCH_MODE; |
| break; |
| case RSL_MT_IPAC_PDCH_ACT_NACK: |
| LOGP(DRSL, LOGL_ERROR, "%s IPAC PDCH ACT NACK\n", ts_name); |
| break; |
| case RSL_MT_IPAC_PDCH_DEACT_ACK: |
| DEBUGP(DRSL, "%s IPAC PDCH DEACT ACK\n", ts_name); |
| msg->lchan->ts->flags &= ~TS_F_PDCH_MODE; |
| break; |
| case RSL_MT_IPAC_PDCH_DEACT_NACK: |
| LOGP(DRSL, LOGL_ERROR, "%s IPAC PDCH DEACT NACK\n", ts_name); |
| 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: |
| LOGP(DRSL, LOGL_NOTICE, "%s Unimplemented Abis RSL DChan " |
| "msg 0x%02x\n", ts_name, rslh->c.msg_type); |
| break; |
| default: |
| LOGP(DRSL, LOGL_NOTICE, "%s unknown Abis RSL DChan msg 0x%02x\n", |
| ts_name, 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); |
| struct tlv_parsed tp; |
| |
| LOGP(DRSL, LOGL_ERROR, "%s ERROR REPORT ", gsm_trx_name(msg->trx)); |
| |
| rsl_tlv_parse(&tp, rslh->data, msgb_l2len(msg)-sizeof(*rslh)); |
| |
| if (TLVP_PRESENT(&tp, RSL_IE_CAUSE)) |
| print_rsl_cause(LOGL_ERROR, TLVP_VAL(&tp, RSL_IE_CAUSE), |
| TLVP_LEN(&tp, RSL_IE_CAUSE)); |
| |
| LOGPC(DRSL, LOGL_ERROR, "\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, "%s RF Resource Indication\n", gsm_trx_name(msg->trx)); |
| break; |
| case RSL_MT_OVERLOAD: |
| /* indicate CCCH / ACCH / processor overload */ |
| LOGP(DRSL, LOGL_ERROR, "%s CCCH/ACCH/CPU Overload\n", |
| gsm_trx_name(msg->trx)); |
| break; |
| default: |
| LOGP(DRSL, LOGL_NOTICE, "%s Unknown Abis RSL TRX message " |
| "type 0x%02x\n", gsm_trx_name(msg->trx), rslh->msg_type); |
| return -EINVAL; |
| } |
| return rc; |
| } |
| |
| /* If T3101 expires, we never received a response to IMMEDIATE ASSIGN */ |
| static void t3101_expired(void *data) |
| { |
| struct gsm_lchan *lchan = data; |
| |
| rsl_rf_chan_release(lchan); |
| } |
| |
| /* 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, bts->network->neci); |
| chreq_reason = get_reason_by_chreq(bts, rqd_ref->ra, bts->network->neci); |
| |
| counter_inc(bts->network->stats.chreq.total); |
| |
| /* check availability / allocate channel */ |
| lchan = lchan_alloc(bts, lctype); |
| if (!lchan) { |
| LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: no resources for %s 0x%x\n", |
| msg->lchan->ts->trx->bts->nr, gsm_lchant_name(lctype), rqd_ref->ra); |
| counter_inc(bts->network->stats.chreq.no_channel); |
| /* FIXME: send some kind of reject ?!? */ |
| return -ENOMEM; |
| } |
| |
| if (lchan->state != LCHAN_S_NONE) |
| LOGP(DRSL, LOGL_NOTICE, "%s lchan_alloc() returned channel " |
| "in state %s\n", gsm_lchan_name(lchan), |
| gsm_lchans_name(lchan->state)); |
| rsl_lchan_set_state(lchan, LCHAN_S_ACT_REQ); |
| |
| ts_number = lchan->ts->nr; |
| arfcn = lchan->ts->trx->arfcn; |
| subch = lchan->nr; |
| |
| lchan->encr.alg_id = RSL_ENC_ALG_A5(0); /* no encryption */ |
| lchan->ms_power = ms_pwr_ctl_lvl(bts->band, bts->ms_max_power); |
| lchan->bs_power = 0; /* 0dB reduction, output power = Pn */ |
| lchan->rsl_cmode = RSL_CMOD_SPD_SIGN; |
| lchan->tch_mode = GSM48_CMODE_SIGN; |
| rsl_chan_activate_lchan(lchan, 0x00, rqd_ta, 0); |
| |
| /* 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 = bts->tsc; |
| /* 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, "%s Activating ARFCN(%u) SS(%u) lctype %s " |
| "r=%s ra=0x%02x\n", gsm_lchan_name(lchan), arfcn, subch, |
| gsm_lchant_name(lchan->type), gsm_chreq_name(chreq_reason), |
| rqd_ref->ra); |
| |
| /* Start timer T3101 to wait for GSM48_MT_RR_PAG_RESP */ |
| lchan->T3101.cb = t3101_expired; |
| lchan->T3101.data = lchan; |
| bsc_schedule_timer(&lchan->T3101, bts->network->T3101, 0); |
| |
| /* 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]; |
| if (is_ipaccess_bts(msg->trx->bts) && pg_buf_space == 0xffff) { |
| /* paging load below configured threshold, use 50 as default */ |
| pg_buf_space = 50; |
| } |
| 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 */ |
| LOGP(DRSL, LOGL_NOTICE, "Unimplemented Abis RSL TRX message " |
| "type 0x%02x\n", rslh->c.msg_type); |
| break; |
| default: |
| LOGP(DRSL, LOGL_NOTICE, "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; |
| |
| LOGP(DRLL, LOGL_ERROR, "%s ERROR INDICATION cause=%s\n", |
| gsm_lchan_name(msg->lchan), |
| rsl_rlm_cause_name(rlm_cause[1])); |
| |
| rll_indication(msg->lchan, rllh->link_id, BSC_RLLR_IND_ERR_IND); |
| |
| if (rlm_cause[1] == RLL_CAUSE_T200_EXPIRED) { |
| counter_inc(msg->lchan->ts->trx->bts->network->stats.chan.rll_err); |
| return rsl_rf_chan_release(msg->lchan); |
| } |
| |
| 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; |
| u_int8_t sapi = rllh->link_id & 7; |
| |
| msg->lchan = lchan_lookup(msg->trx, rllh->chan_nr); |
| ts_name = gsm_lchan_name(msg->lchan); |
| DEBUGP(DRLL, "%s SAPI=%u ", ts_name, sapi); |
| |
| 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, rllh->link_id); |
| } |
| break; |
| case RSL_MT_EST_IND: |
| DEBUGPC(DRLL, "ESTABLISH INDICATION\n"); |
| /* lchan is established, stop T3101 */ |
| msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_MS; |
| bsc_del_timer(&msg->lchan->T3101); |
| 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, rllh->link_id); |
| } |
| break; |
| case RSL_MT_EST_CONF: |
| DEBUGPC(DRLL, "ESTABLISH CONFIRM\n"); |
| msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_NET; |
| rll_indication(msg->lchan, rllh->link_id, |
| BSC_RLLR_IND_EST_CONF); |
| break; |
| case RSL_MT_REL_IND: |
| /* BTS informs us of having received DISC from MS */ |
| DEBUGPC(DRLL, "RELEASE INDICATION\n"); |
| msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_UNUSED; |
| rll_indication(msg->lchan, rllh->link_id, |
| BSC_RLLR_IND_REL_IND); |
| /* we can now releae the channel on the BTS/Abis side */ |
| /* FIXME: officially we need to start T3111 and wait for |
| * some grace period */ |
| rsl_rf_chan_release(msg->lchan); |
| break; |
| case RSL_MT_REL_CONF: |
| /* BTS informs us of having received UA from MS, |
| * in response to DISC that we've sent earlier */ |
| DEBUGPC(DRLL, "RELEASE CONFIRMATION\n"); |
| msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_UNUSED; |
| /* we can now releae the channel on the BTS/Abis side */ |
| /* FIXME: officially we need to start T3111 and wait for |
| * some grace period */ |
| rsl_rf_chan_release(msg->lchan); |
| break; |
| case RSL_MT_ERROR_IND: |
| rc = rsl_rx_rll_err_ind(msg); |
| break; |
| case RSL_MT_UNIT_DATA_IND: |
| LOGP(DRLL, LOGL_NOTICE, "unimplemented Abis RLL message " |
| "type 0x%02x\n", rllh->c.msg_type); |
| break; |
| default: |
| LOGP(DRLL, LOGL_NOTICE, "unknown Abis RLL message " |
| "type 0x%02x\n", rllh->c.msg_type); |
| } |
| return rc; |
| } |
| |
| static u_int8_t ipa_smod_s_for_lchan(struct gsm_lchan *lchan) |
| { |
| switch (lchan->tch_mode) { |
| case GSM48_CMODE_SPEECH_V1: |
| switch (lchan->type) { |
| case GSM_LCHAN_TCH_F: |
| return 0x00; |
| case GSM_LCHAN_TCH_H: |
| return 0x03; |
| default: |
| break; |
| } |
| case GSM48_CMODE_SPEECH_EFR: |
| switch (lchan->type) { |
| case GSM_LCHAN_TCH_F: |
| return 0x01; |
| /* there's no half-rate EFR */ |
| default: |
| break; |
| } |
| case GSM48_CMODE_SPEECH_AMR: |
| switch (lchan->type) { |
| case GSM_LCHAN_TCH_F: |
| return 0x02; |
| case GSM_LCHAN_TCH_H: |
| return 0x05; |
| default: |
| break; |
| } |
| default: |
| break; |
| } |
| LOGP(DRSL, LOGL_ERROR, "Cannot determine ip.access speech mode for " |
| "tch_mode == 0x%02x\n", lchan->tch_mode); |
| return 0; |
| } |
| |
| static u_int8_t ipa_rtp_pt_for_lchan(struct gsm_lchan *lchan) |
| { |
| switch (lchan->tch_mode) { |
| case GSM48_CMODE_SPEECH_V1: |
| switch (lchan->type) { |
| case GSM_LCHAN_TCH_F: |
| return RTP_PT_GSM_FULL; |
| case GSM_LCHAN_TCH_H: |
| return RTP_PT_GSM_HALF; |
| default: |
| break; |
| } |
| case GSM48_CMODE_SPEECH_EFR: |
| switch (lchan->type) { |
| case GSM_LCHAN_TCH_F: |
| return RTP_PT_GSM_EFR; |
| /* there's no half-rate EFR */ |
| default: |
| break; |
| } |
| case GSM48_CMODE_SPEECH_AMR: |
| switch (lchan->type) { |
| case GSM_LCHAN_TCH_F: |
| return RTP_PT_AMR_FULL; |
| case GSM_LCHAN_TCH_H: |
| return RTP_PT_AMR_HALF; |
| default: |
| break; |
| } |
| default: |
| break; |
| } |
| LOGP(DRSL, LOGL_ERROR, "Cannot determine ip.access rtp payload type for " |
| "tch_mode == 0x%02x\n & lchan_type == %d", |
| lchan->tch_mode, lchan->type); |
| return 0; |
| } |
| |
| /* ip.access specific RSL extensions */ |
| static void ipac_parse_rtp(struct gsm_lchan *lchan, struct tlv_parsed *tv) |
| { |
| struct in_addr ip; |
| u_int16_t port, conn_id; |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_LOCAL_IP)) { |
| ip.s_addr = *((u_int32_t *) TLVP_VAL(tv, RSL_IE_IPAC_LOCAL_IP)); |
| DEBUGPC(DRSL, "LOCAL_IP=%s ", inet_ntoa(ip)); |
| lchan->abis_ip.bound_ip = ntohl(ip.s_addr); |
| } |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_LOCAL_PORT)) { |
| port = *((u_int16_t *) TLVP_VAL(tv, RSL_IE_IPAC_LOCAL_PORT)); |
| port = ntohs(port); |
| DEBUGPC(DRSL, "LOCAL_PORT=%u ", port); |
| lchan->abis_ip.bound_port = port; |
| } |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_CONN_ID)) { |
| conn_id = *((u_int16_t *) TLVP_VAL(tv, RSL_IE_IPAC_CONN_ID)); |
| conn_id = ntohs(conn_id); |
| DEBUGPC(DRSL, "CON_ID=%u ", conn_id); |
| lchan->abis_ip.conn_id = conn_id; |
| } |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_RTP_PAYLOAD2)) { |
| lchan->abis_ip.rtp_payload2 = |
| *TLVP_VAL(tv, RSL_IE_IPAC_RTP_PAYLOAD2); |
| DEBUGPC(DRSL, "RTP_PAYLOAD2=0x%02x ", |
| lchan->abis_ip.rtp_payload2); |
| } |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_SPEECH_MODE)) { |
| lchan->abis_ip.speech_mode = |
| *TLVP_VAL(tv, RSL_IE_IPAC_SPEECH_MODE); |
| DEBUGPC(DRSL, "speech_mode=0x%02x ", |
| lchan->abis_ip.speech_mode); |
| } |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_REMOTE_IP)) { |
| ip.s_addr = *((u_int32_t *) TLVP_VAL(tv, RSL_IE_IPAC_REMOTE_IP)); |
| DEBUGPC(DRSL, "REMOTE_IP=%s ", inet_ntoa(ip)); |
| lchan->abis_ip.connect_ip = ntohl(ip.s_addr); |
| } |
| |
| if (TLVP_PRESENT(tv, RSL_IE_IPAC_REMOTE_PORT)) { |
| port = *((u_int16_t *) TLVP_VAL(tv, RSL_IE_IPAC_REMOTE_PORT)); |
| port = ntohs(port); |
| DEBUGPC(DRSL, "REMOTE_PORT=%u ", port); |
| lchan->abis_ip.connect_port = port; |
| } |
| } |
| |
| int rsl_ipacc_crcx(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_CRCX); |
| dh->c.msg_discr = ABIS_RSL_MDISC_IPACCESS; |
| dh->chan_nr = lchan2chan_nr(lchan); |
| |
| /* 0x1- == receive-only, 0x-1 == EFR codec */ |
| lchan->abis_ip.speech_mode = 0x10 | ipa_smod_s_for_lchan(lchan); |
| lchan->abis_ip.rtp_payload = ipa_rtp_pt_for_lchan(lchan); |
| msgb_tv_put(msg, RSL_IE_IPAC_SPEECH_MODE, lchan->abis_ip.speech_mode); |
| msgb_tv_put(msg, RSL_IE_IPAC_RTP_PAYLOAD, lchan->abis_ip.rtp_payload); |
| |
| DEBUGP(DRSL, "%s IPAC_BIND speech_mode=0x%02x RTP_PAYLOAD=%d\n", |
| gsm_lchan_name(lchan), lchan->abis_ip.speech_mode, |
| lchan->abis_ip.rtp_payload); |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| int rsl_ipacc_mdcx(struct gsm_lchan *lchan, u_int32_t ip, u_int16_t port, |
| u_int8_t rtp_payload2) |
| { |
| struct msgb *msg = rsl_msgb_alloc(); |
| struct abis_rsl_dchan_hdr *dh; |
| u_int32_t *att_ip; |
| struct in_addr ia; |
| |
| dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| init_dchan_hdr(dh, RSL_MT_IPAC_MDCX); |
| dh->c.msg_discr = ABIS_RSL_MDISC_IPACCESS; |
| dh->chan_nr = lchan2chan_nr(lchan); |
| |
| /* we need to store these now as MDCX_ACK does not return them :( */ |
| lchan->abis_ip.rtp_payload2 = rtp_payload2; |
| lchan->abis_ip.connect_port = port; |
| lchan->abis_ip.connect_ip = ip; |
| |
| /* 0x0- == both directions, 0x-1 == EFR codec */ |
| lchan->abis_ip.speech_mode = 0x00 | ipa_smod_s_for_lchan(lchan); |
| lchan->abis_ip.rtp_payload = ipa_rtp_pt_for_lchan(lchan); |
| |
| ia.s_addr = htonl(ip); |
| DEBUGP(DRSL, "%s IPAC_MDCX IP=%s PORT=%d RTP_PAYLOAD=%d RTP_PAYLOAD2=%d " |
| "CONN_ID=%d speech_mode=0x%02x\n", gsm_lchan_name(lchan), |
| inet_ntoa(ia), port, lchan->abis_ip.rtp_payload, rtp_payload2, |
| lchan->abis_ip.conn_id, lchan->abis_ip.speech_mode); |
| |
| msgb_tv16_put(msg, RSL_IE_IPAC_CONN_ID, lchan->abis_ip.conn_id); |
| msgb_v_put(msg, RSL_IE_IPAC_REMOTE_IP); |
| att_ip = (u_int32_t *) msgb_put(msg, sizeof(ip)); |
| *att_ip = ia.s_addr; |
| msgb_tv16_put(msg, RSL_IE_IPAC_REMOTE_PORT, port); |
| msgb_tv_put(msg, RSL_IE_IPAC_SPEECH_MODE, lchan->abis_ip.speech_mode); |
| msgb_tv_put(msg, RSL_IE_IPAC_RTP_PAYLOAD, lchan->abis_ip.rtp_payload); |
| if (rtp_payload2) |
| msgb_tv_put(msg, RSL_IE_IPAC_RTP_PAYLOAD2, rtp_payload2); |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| /* tell BTS to connect RTP stream to our local RTP socket */ |
| int rsl_ipacc_mdcx_to_rtpsock(struct gsm_lchan *lchan) |
| { |
| struct rtp_socket *rs = lchan->abis_ip.rtp_socket; |
| int rc; |
| |
| rc = rsl_ipacc_mdcx(lchan, ntohl(rs->rtp.sin_local.sin_addr.s_addr), |
| ntohs(rs->rtp.sin_local.sin_port), |
| /* FIXME: use RTP payload of bound socket, not BTS*/ |
| lchan->abis_ip.rtp_payload2); |
| |
| return rc; |
| } |
| |
| int rsl_ipacc_pdch_activate(struct gsm_lchan *lchan, int act) |
| { |
| struct msgb *msg = rsl_msgb_alloc(); |
| struct abis_rsl_dchan_hdr *dh; |
| u_int8_t msg_type; |
| |
| if (act) |
| msg_type = RSL_MT_IPAC_PDCH_ACT; |
| else |
| msg_type = RSL_MT_IPAC_PDCH_DEACT; |
| |
| dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| init_dchan_hdr(dh, msg_type); |
| dh->c.msg_discr = ABIS_RSL_MDISC_DED_CHAN; |
| dh->chan_nr = lchan2chan_nr(lchan); |
| |
| DEBUGP(DRSL, "%s IPAC_PDCH_%sACT\n", gsm_lchan_name(lchan), |
| act ? "" : "DE"); |
| |
| msg->trx = lchan->ts->trx; |
| |
| return abis_rsl_sendmsg(msg); |
| } |
| |
| static int abis_rsl_rx_ipacc_crcx_ack(struct msgb *msg) |
| { |
| struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); |
| struct tlv_parsed tv; |
| struct gsm_lchan *lchan = msg->lchan; |
| |
| /* 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, RSL_IE_IPAC_CONN_ID)) { |
| LOGP(DRSL, LOGL_NOTICE, "mandatory IE missing"); |
| return -EINVAL; |
| } |
| |
| ipac_parse_rtp(lchan, &tv); |
| |
| /* in case we don't use direct BTS-to-BTS RTP */ |
| if (!ipacc_rtp_direct) { |
| int rc; |
| /* the BTS has successfully bound a TCH to a local ip/port, |
| * which means we can connect our UDP socket to it */ |
| if (lchan->abis_ip.rtp_socket) { |
| rtp_socket_free(lchan->abis_ip.rtp_socket); |
| lchan->abis_ip.rtp_socket = NULL; |
| } |
| |
| lchan->abis_ip.rtp_socket = rtp_socket_create(); |
| if (!lchan->abis_ip.rtp_socket) |
| goto out_err; |
| |
| rc = rtp_socket_connect(lchan->abis_ip.rtp_socket, |
| lchan->abis_ip.bound_ip, |
| lchan->abis_ip.bound_port); |
| if (rc < 0) |
| goto out_err; |
| } |
| |
| dispatch_signal(SS_ABISIP, S_ABISIP_CRCX_ACK, msg->lchan); |
| |
| return 0; |
| out_err: |
| return -EIO; |
| } |
| |
| static int abis_rsl_rx_ipacc_mdcx_ack(struct msgb *msg) |
| { |
| struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); |
| struct tlv_parsed tv; |
| struct gsm_lchan *lchan = msg->lchan; |
| |
| /* the BTS has acknowledged a remote connect request and |
| * it now tells us the IP address and port number to which it has |
| * connected the given logical channel */ |
| |
| rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh)); |
| ipac_parse_rtp(lchan, &tv); |
| dispatch_signal(SS_ABISIP, S_ABISIP_MDCX_ACK, msg->lchan); |
| |
| return 0; |
| } |
| |
| static int abis_rsl_rx_ipacc_dlcx_ind(struct msgb *msg) |
| { |
| struct abis_rsl_dchan_hdr *dh = msgb_l2(msg); |
| struct tlv_parsed tv; |
| struct gsm_lchan *lchan = msg->lchan; |
| |
| rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh)); |
| |
| if (TLVP_PRESENT(&tv, RSL_IE_CAUSE)) |
| print_rsl_cause(LOGL_DEBUG, TLVP_VAL(&tv, RSL_IE_CAUSE), |
| TLVP_LEN(&tv, RSL_IE_CAUSE)); |
| |
| /* the BTS tells us a RTP stream has been disconnected */ |
| if (lchan->abis_ip.rtp_socket) { |
| rtp_socket_free(lchan->abis_ip.rtp_socket); |
| lchan->abis_ip.rtp_socket = NULL; |
| } |
| |
| dispatch_signal(SS_ABISIP, S_ABISIP_DLCX_IND, msg->lchan); |
| |
| return 0; |
| } |
| |
| static int abis_rsl_rx_ipacc(struct msgb *msg) |
| { |
| struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); |
| char *ts_name; |
| int rc = 0; |
| |
| msg->lchan = lchan_lookup(msg->trx, rllh->chan_nr); |
| ts_name = gsm_lchan_name(msg->lchan); |
| |
| switch (rllh->c.msg_type) { |
| case RSL_MT_IPAC_CRCX_ACK: |
| DEBUGP(DRSL, "%s IPAC_CRCX_ACK ", ts_name); |
| rc = abis_rsl_rx_ipacc_crcx_ack(msg); |
| break; |
| case RSL_MT_IPAC_CRCX_NACK: |
| /* somehow the BTS was unable to bind the lchan to its local |
| * port?!? */ |
| LOGP(DRSL, LOGL_ERROR, "%s IPAC_CRCX_NACK\n", ts_name); |
| break; |
| case RSL_MT_IPAC_MDCX_ACK: |
| /* the BTS tells us that a connect operation was successful */ |
| DEBUGP(DRSL, "%s IPAC_MDCX_ACK ", ts_name); |
| rc = abis_rsl_rx_ipacc_mdcx_ack(msg); |
| break; |
| case RSL_MT_IPAC_MDCX_NACK: |
| /* somehow the BTS was unable to connect the lchan to a remote |
| * port */ |
| LOGP(DRSL, LOGL_ERROR, "%s IPAC_MDCX_NACK\n", ts_name); |
| break; |
| case RSL_MT_IPAC_DLCX_IND: |
| DEBUGP(DRSL, "%s IPAC_DLCX_IND ", ts_name); |
| rc = abis_rsl_rx_ipacc_dlcx_ind(msg); |
| break; |
| default: |
| LOGP(DRSL, LOGL_NOTICE, "Unknown ip.access msg_type 0x%02x\n", |
| 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; |
| int rc = 0; |
| |
| if (!msg) { |
| DEBUGP(DRSL, "Empty RSL msg?..\n"); |
| return -1; |
| } |
| |
| if (msgb_l2len(msg) < sizeof(*rslh)) { |
| DEBUGP(DRSL, "Truncated RSL message with l2len: %u\n", msgb_l2len(msg)); |
| return -1; |
| } |
| |
| rslh = msgb_l2(msg); |
| |
| 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: |
| LOGP(DRSL, LOGL_NOTICE, "unimplemented RSL msg disc 0x%02x\n", |
| rslh->msg_discr); |
| break; |
| case ABIS_RSL_MDISC_IPACCESS: |
| rc = abis_rsl_rx_ipacc(msg); |
| break; |
| default: |
| LOGP(DRSL, LOGL_NOTICE, "unknown RSL message discriminator " |
| "0x%02x\n", rslh->msg_discr); |
| return -EINVAL; |
| } |
| msgb_free(msg); |
| return rc; |
| } |
| |
| /* From Table 10.5.33 of GSM 04.08 */ |
| int rsl_number_of_paging_subchannels(struct gsm_bts *bts) |
| { |
| if (bts->si_common.chan_desc.ccch_conf == RSL_BCCH_CCCH_CONF_1_C) { |
| return MAX(1, (3 - bts->si_common.chan_desc.bs_ag_blks_res)) |
| * (bts->si_common.chan_desc.bs_pa_mfrms + 2); |
| } else { |
| return (9 - bts->si_common.chan_desc.bs_ag_blks_res) |
| * (bts->si_common.chan_desc.bs_pa_mfrms + 2); |
| } |
| } |