Common library for all Osmocom projects (libosmocore, libosmogsm, libosmovty, libosmogb, libosmosim, libosmousb, ...) https://osmocom.org/projects/libosmocore
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libosmocore/src/gsm/rsl.c

371 lines
12 KiB

/* 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 <stdint.h>
#include <stdio.h>
#include <errno.h>
#include <osmocore/tlv.h>
#include <osmocore/rsl.h>
#define RSL_ALLOC_SIZE 200
#define RSL_ALLOC_HEADROOM 56
void rsl_init_rll_hdr(struct abis_rsl_rll_hdr *dh, uint8_t 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;
}
void rsl_init_cchan_hdr(struct abis_rsl_cchan_hdr *ch, uint8_t msg_type)
{
ch->c.msg_discr = ABIS_RSL_MDISC_COM_CHAN;
ch->c.msg_type = msg_type;
ch->ie_chan = RSL_IE_CHAN_NR;
}
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_SIEMENS_MRPCI] = { TLV_TYPE_TV },
[RSL_IE_IPAC_PROXY_UDP] = { TLV_TYPE_FIXED, 2 },
[RSL_IE_IPAC_BSCMPL_TOUT] = { TLV_TYPE_TV },
[RSL_IE_IPAC_REMOTE_IP] = { TLV_TYPE_FIXED, 4 },
[RSL_IE_IPAC_REMOTE_PORT] = { TLV_TYPE_FIXED, 2 },
[RSL_IE_IPAC_RTP_PAYLOAD] = { TLV_TYPE_TV },
[RSL_IE_IPAC_LOCAL_PORT] = { TLV_TYPE_FIXED, 2 },
[RSL_IE_IPAC_SPEECH_MODE] = { TLV_TYPE_TV },
[RSL_IE_IPAC_LOCAL_IP] = { TLV_TYPE_FIXED, 4 },
[RSL_IE_IPAC_CONN_ID] = { TLV_TYPE_FIXED, 2 },
[RSL_IE_IPAC_RTP_CSD_FMT] = { TLV_TYPE_TV },
[RSL_IE_IPAC_RTP_JIT_BUF] = { TLV_TYPE_FIXED, 2 },
[RSL_IE_IPAC_RTP_COMPR] = { TLV_TYPE_TV },
[RSL_IE_IPAC_RTP_PAYLOAD2] = { TLV_TYPE_TV },
[RSL_IE_IPAC_RTP_MPLEX] = { TLV_TYPE_FIXED, 8 },
[RSL_IE_IPAC_RTP_MPLEX_ID] = { TLV_TYPE_TV },
},
};
/* encode channel number as per Section 9.3.1 */
uint8_t rsl_enc_chan_nr(uint8_t type, uint8_t subch, uint8_t timeslot)
{
uint8_t ret;
ret = (timeslot & 0x07) | type;
switch (type) {
case RSL_CHAN_Lm_ACCHs:
subch &= 0x01;
break;
case RSL_CHAN_SDCCH4_ACCH:
subch &= 0x03;
break;
case RSL_CHAN_SDCCH8_ACCH:
subch &= 0x07;
break;
default:
/* no subchannels allowed */
subch = 0x00;
break;
}
ret |= (subch << 3);
return ret;
}
int rsl_dec_chan_nr(uint8_t chan_nr, uint8_t *type, uint8_t *subch, uint8_t *timeslot)
{
*timeslot = chan_nr & 0x7;
if ((chan_nr & 0xf8) == RSL_CHAN_Bm_ACCHs) {
*type = RSL_CHAN_Bm_ACCHs;
*subch = 0;
} else if ((chan_nr & 0xf0) == RSL_CHAN_Lm_ACCHs) {
*type = RSL_CHAN_Lm_ACCHs;
*subch = (chan_nr >> 3) & 0x1;
} else if ((chan_nr & 0xe0) == RSL_CHAN_SDCCH4_ACCH) {
*type = RSL_CHAN_SDCCH4_ACCH;
*subch = (chan_nr >> 3) & 0x3;
} else if ((chan_nr & 0xc0) == RSL_CHAN_SDCCH8_ACCH) {
*type = RSL_CHAN_SDCCH8_ACCH;
*subch = (chan_nr >> 3) & 0x7;
} else if ((chan_nr & 0xf8) == RSL_CHAN_BCCH) {
*type = RSL_CHAN_BCCH;
*subch = 0;
} else if ((chan_nr & 0xf8) == RSL_CHAN_RACH) {
*type = RSL_CHAN_RACH;
*subch = 0;
} else if ((chan_nr & 0xf8) == RSL_CHAN_PCH_AGCH) {
*type = RSL_CHAN_PCH_AGCH;
*subch = 0;
} else
return -EINVAL;
return 0;
}
const char *rsl_chan_nr_str(uint8_t chan_nr)
{
static char str[20];
int ts = chan_nr & 7;
uint8_t cbits = chan_nr >> 3;
if (cbits == 0x01)
sprintf(str, "TCH/F on TS%d", ts);
else if ((cbits & 0x1e) == 0x02)
sprintf(str, "TCH/H(%u) on TS%d", cbits & 0x01, ts);
else if ((cbits & 0x1c) == 0x04)
sprintf(str, "SDCCH/4(%u) on TS%d", cbits & 0x03, ts);
else if ((cbits & 0x18) == 0x08)
sprintf(str, "SDCCH/8(%u) on TS%d", cbits & 0x07, ts);
else if (cbits == 0x10)
sprintf(str, "BCCH on TS%d", ts);
else if (cbits == 0x11)
sprintf(str, "RACH on TS%d", ts);
else if (cbits == 0x12)
sprintf(str, "PCH/AGCH on TS%d", ts);
else
sprintf(str, "UNKNOWN on TS%d", ts);
return str;
}
static const struct value_string rsl_err_vals[] = {
{ RSL_ERR_RADIO_IF_FAIL, "Radio Interface Failure" },
{ RSL_ERR_RADIO_LINK_FAIL, "Radio Link Failure" },
{ RSL_ERR_HANDOVER_ACC_FAIL, "Handover Access Failure" },
{ RSL_ERR_TALKER_ACC_FAIL, "Talker Access Failure" },
{ RSL_ERR_OM_INTERVENTION, "O&M Intervention" },
{ RSL_ERR_NORMAL_UNSPEC, "Normal event, unspecified" },
{ RSL_ERR_T_MSRFPCI_EXP, "Siemens: T_MSRFPCI Expired" },
{ RSL_ERR_EQUIPMENT_FAIL, "Equipment Failure" },
{ RSL_ERR_RR_UNAVAIL, "Radio Resource not available" },
{ RSL_ERR_TERR_CH_FAIL, "Terrestrial Channel Failure" },
{ RSL_ERR_CCCH_OVERLOAD, "CCCH Overload" },
{ RSL_ERR_ACCH_OVERLOAD, "ACCH Overload" },
{ RSL_ERR_PROCESSOR_OVERLOAD, "Processor Overload" },
{ RSL_ERR_RES_UNAVAIL, "Resource not available, unspecified" },
{ RSL_ERR_TRANSC_UNAVAIL, "Transcoding not available" },
{ RSL_ERR_SERV_OPT_UNAVAIL, "Service or Option not available" },
{ RSL_ERR_ENCR_UNIMPL, "Encryption algorithm not implemented" },
{ RSL_ERR_SERV_OPT_UNIMPL, "Service or Option not implemented" },
{ RSL_ERR_RCH_ALR_ACTV_ALLOC, "Radio channel already activated" },
{ RSL_ERR_INVALID_MESSAGE, "Invalid Message, unspecified" },
{ RSL_ERR_MSG_DISCR, "Message Discriminator Error" },
{ RSL_ERR_MSG_TYPE, "Message Type Error" },
{ RSL_ERR_MSG_SEQ, "Message Sequence Error" },
{ RSL_ERR_IE_ERROR, "General IE error" },
{ RSL_ERR_MAND_IE_ERROR, "Mandatory IE error" },
{ RSL_ERR_OPT_IE_ERROR, "Optional IE error" },
{ RSL_ERR_IE_NONEXIST, "IE non-existent" },
{ RSL_ERR_IE_LENGTH, "IE length error" },
{ RSL_ERR_IE_CONTENT, "IE content error" },
{ RSL_ERR_PROTO, "Protocol error, unspecified" },
{ RSL_ERR_INTERWORKING, "Interworking error, unspecified" },
{ 0, NULL }
};
const char *rsl_err_name(uint8_t err)
{
return get_value_string(rsl_err_vals, err);
}
static const struct value_string rsl_rlm_cause_strs[] = {
{ RLL_CAUSE_T200_EXPIRED, "Timer T200 expired (N200+1) times" },
{ RLL_CAUSE_REEST_REQ, "Re-establishment request" },
{ RLL_CAUSE_UNSOL_UA_RESP, "Unsolicited UA response" },
{ RLL_CAUSE_UNSOL_DM_RESP, "Unsolicited DM response" },
{ RLL_CAUSE_UNSOL_DM_RESP_MF, "Unsolicited DM response, multiple frame" },
{ RLL_CAUSE_UNSOL_SPRV_RESP, "Unsolicited supervisory response" },
{ RLL_CAUSE_SEQ_ERR, "Sequence Error" },
{ RLL_CAUSE_UFRM_INC_PARAM, "U-Frame with incorrect parameters" },
{ RLL_CAUSE_SFRM_INC_PARAM, "S-Frame with incorrect parameters" },
{ RLL_CAUSE_IFRM_INC_MBITS, "I-Frame with incorrect use of M bit" },
{ RLL_CAUSE_IFRM_INC_LEN, "I-Frame with incorrect length" },
{ RLL_CAUSE_FRM_UNIMPL, "Fraeme not implemented" },
{ RLL_CAUSE_SABM_MF, "SABM command, multiple frame established state" },
{ RLL_CAUSE_SABM_INFO_NOTALL, "SABM frame with information not allowed in this state" },
{ 0, NULL },
};
const char *rsl_rlm_cause_name(uint8_t err)
{
return get_value_string(rsl_rlm_cause_strs, err);
}
/* Section 3.3.2.3 TS 05.02. 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;
}
}
/* Section 3.3.2.3 TS 05.02 */
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;
}
}
/* Push a RSL RLL header */
void rsl_rll_push_hdr(struct msgb *msg, uint8_t msg_type, uint8_t chan_nr,
uint8_t link_id, int transparent)
{
struct abis_rsl_rll_hdr *rh;
rh = (struct abis_rsl_rll_hdr *) msgb_push(msg, sizeof(*rh));
rsl_init_rll_hdr(rh, msg_type);
if (transparent)
rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
rh->chan_nr = chan_nr;
rh->link_id = link_id;
/* set the l2 header pointer */
msg->l2h = (uint8_t *)rh;
}
/* Push a RSL RLL header with L3_INFO IE */
void rsl_rll_push_l3(struct msgb *msg, uint8_t msg_type, uint8_t chan_nr,
uint8_t link_id, int transparent)
{
uint8_t l3_len = msg->tail - (uint8_t *)msgb_l3(msg);
/* construct a RSLms RLL message (DATA INDICATION, UNIT DATA
* INDICATION) and send it off via RSLms */
/* Push the L3 IE tag and lengh */
msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len);
/* Then push the RSL header */
rsl_rll_push_hdr(msg, msg_type, chan_nr, link_id, transparent);
}
struct msgb *rsl_rll_simple(uint8_t msg_type, uint8_t chan_nr,
uint8_t link_id, int transparent)
{
struct abis_rsl_rll_hdr *rh;
struct msgb *msg;
msg = msgb_alloc_headroom(RSL_ALLOC_SIZE+RSL_ALLOC_HEADROOM,
RSL_ALLOC_HEADROOM, "rsl_rll_simple");
if (!msg)
return NULL;
/* put the RSL header */
rh = (struct abis_rsl_rll_hdr *) msgb_put(msg, sizeof(*rh));
rsl_init_rll_hdr(rh, msg_type);
if (transparent)
rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
rh->chan_nr = chan_nr;
rh->link_id = link_id;
/* set the l2 header pointer */
msg->l2h = (uint8_t *)rh;
return msg;
}