diff options
Diffstat (limited to 'libosmocore/src/rsl.c')
-rw-r--r-- | libosmocore/src/rsl.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/libosmocore/src/rsl.c b/libosmocore/src/rsl.c new file mode 100644 index 000000000..c864b12f7 --- /dev/null +++ b/libosmocore/src/rsl.c @@ -0,0 +1,327 @@ +/* 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 <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; +} + +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; +} + +/* FIXME: convert to value_string */ +static const char *rsl_err_vals[0xff] = { + [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", +}; + +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_err_name(uint8_t err) +{ + if (rsl_err_vals[err]) + return rsl_err_vals[err]; + else + return "unknown"; +} + +/* 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 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); + struct abis_rsl_rll_hdr *rh; + + /* 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 */ + 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; +} + +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; +} |