| /* GSM Mobile Radio Interface Layer 3 messages |
| * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ |
| |
| /* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU 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 <string.h> |
| #include <stdbool.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/utils.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/gsm/gsm48.h> |
| #include <osmocom/gsm/gsm0502.h> |
| #include <osmocom/gsm/gsm_utils.h> |
| #include <osmocom/gsm/protocol/gsm_04_08.h> |
| #include <osmocom/gsm/protocol/gsm_08_58.h> |
| #include <osmocom/gsm/protocol/gsm_04_08_gprs.h> |
| |
| const struct tlv_definition gsm48_att_tlvdef = { |
| .def = { |
| [GSM48_IE_MOBILE_ID] = { TLV_TYPE_TLV }, |
| [GSM48_IE_NAME_LONG] = { TLV_TYPE_TLV }, |
| [GSM48_IE_NAME_SHORT] = { TLV_TYPE_TLV }, |
| [GSM48_IE_UTC] = { TLV_TYPE_TV }, |
| [GSM48_IE_NET_TIME_TZ] = { TLV_TYPE_FIXED, 7 }, |
| [GSM48_IE_LSA_IDENT] = { TLV_TYPE_TLV }, |
| |
| [GSM48_IE_BEARER_CAP] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CAUSE] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CC_CAP] = { TLV_TYPE_TLV }, |
| [GSM48_IE_ALERT] = { TLV_TYPE_TLV }, |
| [GSM48_IE_FACILITY] = { TLV_TYPE_TLV }, |
| [GSM48_IE_PROGR_IND] = { TLV_TYPE_TLV }, |
| [GSM48_IE_AUX_STATUS] = { TLV_TYPE_TLV }, |
| [GSM48_IE_NOTIFY] = { TLV_TYPE_TV }, |
| [GSM48_IE_KPD_FACILITY] = { TLV_TYPE_TV }, |
| [GSM48_IE_SIGNAL] = { TLV_TYPE_TV }, |
| [GSM48_IE_CONN_BCD] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CONN_SUB] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CALLING_BCD] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CALLING_SUB] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CALLED_BCD] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CALLED_SUB] = { TLV_TYPE_TLV }, |
| [GSM48_IE_REDIR_BCD] = { TLV_TYPE_TLV }, |
| [GSM48_IE_REDIR_SUB] = { TLV_TYPE_TLV }, |
| [GSM48_IE_LOWL_COMPAT] = { TLV_TYPE_TLV }, |
| [GSM48_IE_HIGHL_COMPAT] = { TLV_TYPE_TLV }, |
| [GSM48_IE_USER_USER] = { TLV_TYPE_TLV }, |
| [GSM48_IE_SS_VERS] = { TLV_TYPE_TLV }, |
| [GSM48_IE_MORE_DATA] = { TLV_TYPE_T }, |
| [GSM48_IE_CLIR_SUPP] = { TLV_TYPE_T }, |
| [GSM48_IE_CLIR_INVOC] = { TLV_TYPE_T }, |
| [GSM48_IE_REV_C_SETUP] = { TLV_TYPE_T }, |
| [GSM48_IE_REPEAT_CIR] = { TLV_TYPE_T }, |
| [GSM48_IE_REPEAT_SEQ] = { TLV_TYPE_T }, |
| /* FIXME: more elements */ |
| }, |
| }; |
| |
| /* RR elements */ |
| const struct tlv_definition gsm48_rr_att_tlvdef = { |
| .def = { |
| /* NOTE: Don't add IE 17 = MOBILE_ID here, it already used. */ |
| [GSM48_IE_VGCS_TARGET] = { TLV_TYPE_TLV }, |
| [GSM48_IE_FRQSHORT_AFTER] = { TLV_TYPE_FIXED, 9 }, |
| [GSM48_IE_MUL_RATE_CFG] = { TLV_TYPE_TLV }, |
| [GSM48_IE_FREQ_L_AFTER] = { TLV_TYPE_TLV }, |
| [GSM48_IE_MSLOT_DESC] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CHANMODE_2] = { TLV_TYPE_TV }, |
| [GSM48_IE_FRQSHORT_BEFORE] = { TLV_TYPE_FIXED, 9 }, |
| [GSM48_IE_CHANMODE_3] = { TLV_TYPE_TV }, |
| [GSM48_IE_CHANMODE_4] = { TLV_TYPE_TV }, |
| [GSM48_IE_CHANMODE_5] = { TLV_TYPE_TV }, |
| [GSM48_IE_CHANMODE_6] = { TLV_TYPE_TV }, |
| [GSM48_IE_CHANMODE_7] = { TLV_TYPE_TV }, |
| [GSM48_IE_CHANMODE_8] = { TLV_TYPE_TV }, |
| [GSM48_IE_FREQ_L_BEFORE] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CH_DESC_1_BEFORE] = { TLV_TYPE_FIXED, 3 }, |
| [GSM48_IE_CH_DESC_2_BEFORE] = { TLV_TYPE_FIXED, 3 }, |
| [GSM48_IE_F_CH_SEQ_BEFORE] = { TLV_TYPE_FIXED, 9 }, |
| [GSM48_IE_CLASSMARK3] = { TLV_TYPE_TLV }, |
| [GSM48_IE_MA_BEFORE] = { TLV_TYPE_TLV }, |
| [GSM48_IE_RR_PACKET_UL] = { TLV_TYPE_TLV }, |
| [GSM48_IE_RR_PACKET_DL] = { TLV_TYPE_TLV }, |
| [GSM48_IE_CELL_CH_DESC] = { TLV_TYPE_FIXED, 16 }, |
| [GSM48_IE_CHANMODE_1] = { TLV_TYPE_TV }, |
| [GSM48_IE_CHDES_2_AFTER] = { TLV_TYPE_FIXED, 3 }, |
| [GSM48_IE_MODE_SEC_CH] = { TLV_TYPE_TV }, |
| [GSM48_IE_F_CH_SEQ_AFTER] = { TLV_TYPE_FIXED, 9 }, |
| [GSM48_IE_MA_AFTER] = { TLV_TYPE_TLV }, |
| [GSM48_IE_BA_RANGE] = { TLV_TYPE_TLV }, |
| [GSM48_IE_GROUP_CHDES] = { TLV_TYPE_TLV }, |
| [GSM48_IE_BA_LIST_PREF] = { TLV_TYPE_TLV }, |
| [GSM48_IE_MOB_OVSERV_DIF] = { TLV_TYPE_TLV }, |
| [GSM48_IE_REALTIME_DIFF] = { TLV_TYPE_TLV }, |
| [GSM48_IE_START_TIME] = { TLV_TYPE_FIXED, 2 }, |
| [GSM48_IE_TIMING_ADVANCE] = { TLV_TYPE_TV }, |
| [GSM48_IE_GROUP_CIP_SEQ] = { TLV_TYPE_SINGLE_TV }, |
| [GSM48_IE_CIP_MODE_SET] = { TLV_TYPE_SINGLE_TV }, |
| [GSM48_IE_GPRS_RESUMPT] = { TLV_TYPE_SINGLE_TV }, |
| [GSM48_IE_SYNC_IND] = { TLV_TYPE_SINGLE_TV }, |
| }, |
| }; |
| |
| /* MM elements */ |
| const struct tlv_definition gsm48_mm_att_tlvdef = { |
| .def = { |
| [GSM48_IE_MOBILE_ID] = { TLV_TYPE_TLV }, |
| [GSM48_IE_NAME_LONG] = { TLV_TYPE_TLV }, |
| [GSM48_IE_NAME_SHORT] = { TLV_TYPE_TLV }, |
| [GSM48_IE_UTC] = { TLV_TYPE_TV }, |
| [GSM48_IE_NET_TIME_TZ] = { TLV_TYPE_FIXED, 7 }, |
| [GSM48_IE_LSA_IDENT] = { TLV_TYPE_TLV }, |
| [GSM48_IE_NET_DST] = { TLV_TYPE_TLV }, |
| |
| [GSM48_IE_LOCATION_AREA] = { TLV_TYPE_FIXED, 5 }, |
| [GSM48_IE_PRIORITY_LEV] = { TLV_TYPE_SINGLE_TV }, |
| [GSM48_IE_FOLLOW_ON_PROC] = { TLV_TYPE_T }, |
| [GSM48_IE_CTS_PERMISSION] = { TLV_TYPE_T }, |
| }, |
| }; |
| |
| static const struct value_string rr_cause_names[] = { |
| { GSM48_RR_CAUSE_NORMAL, "Normal event" }, |
| { GSM48_RR_CAUSE_ABNORMAL_UNSPEC, "Abnormal release, unspecified" }, |
| { GSM48_RR_CAUSE_ABNORMAL_UNACCT, "Abnormal release, channel unacceptable" }, |
| { GSM48_RR_CAUSE_ABNORMAL_TIMER, "Abnormal release, timer expired" }, |
| { GSM48_RR_CAUSE_ABNORMAL_NOACT, "Abnormal release, no activity on radio path" }, |
| { GSM48_RR_CAUSE_PREMPTIVE_REL, "Preemptive release" }, |
| { GSM48_RR_CAUSE_HNDOVER_IMP, "Handover impossible, timing advance out of range" }, |
| { GSM48_RR_CAUSE_CHAN_MODE_UNACCT, "Channel mode unacceptable" }, |
| { GSM48_RR_CAUSE_FREQ_NOT_IMPL, "Frequency not implemented" }, |
| { GSM48_RR_CAUSE_CALL_CLEARED, "Call already cleared" }, |
| { GSM48_RR_CAUSE_SEMANT_INCORR, "Semantically incorrect message" }, |
| { GSM48_RR_CAUSE_INVALID_MAND_INF, "Invalid mandatory information" }, |
| { GSM48_RR_CAUSE_MSG_TYPE_N, "Message type non-existant or not implemented" }, |
| { GSM48_RR_CAUSE_MSG_TYPE_N_COMPAT, "Message type not compatible with protocol state" }, |
| { GSM48_RR_CAUSE_COND_IE_ERROR, "Conditional IE error" }, |
| { GSM48_RR_CAUSE_NO_CELL_ALLOC_A, "No cell allocation available" }, |
| { GSM48_RR_CAUSE_PROT_ERROR_UNSPC, "Protocol error unspecified" }, |
| { 0, NULL }, |
| }; |
| |
| /* FIXME: convert to value_string */ |
| static const char *cc_state_names[32] = { |
| "NULL", |
| "INITIATED", |
| "MM_CONNECTION_PEND", |
| "MO_CALL_PROC", |
| "CALL_DELIVERED", |
| "illegal state 5", |
| "CALL_PRESENT", |
| "CALL_RECEIVED", |
| "CONNECT_REQUEST", |
| "MO_TERM_CALL_CONF", |
| "ACTIVE", |
| "DISCONNECT_REQ", |
| "DISCONNECT_IND", |
| "illegal state 13", |
| "illegal state 14", |
| "illegal state 15", |
| "illegal state 16", |
| "illegal state 17", |
| "illegal state 18", |
| "RELEASE_REQ", |
| "illegal state 20", |
| "illegal state 21", |
| "illegal state 22", |
| "illegal state 23", |
| "illegal state 24", |
| "illegal state 25", |
| "MO_ORIG_MODIFY", |
| "MO_TERM_MODIFY", |
| "CONNECT_IND", |
| "illegal state 29", |
| "illegal state 30", |
| "illegal state 31", |
| }; |
| |
| const char *gsm48_cc_state_name(uint8_t state) |
| { |
| if (state < ARRAY_SIZE(cc_state_names)) |
| return cc_state_names[state]; |
| |
| return "invalid"; |
| } |
| |
| static const struct value_string cc_msg_names[] = { |
| { GSM48_MT_CC_ALERTING, "ALERTING" }, |
| { GSM48_MT_CC_CALL_PROC, "CALL_PROC" }, |
| { GSM48_MT_CC_PROGRESS, "PROGRESS" }, |
| { GSM48_MT_CC_ESTAB, "ESTAB" }, |
| { GSM48_MT_CC_SETUP, "SETUP" }, |
| { GSM48_MT_CC_ESTAB_CONF, "ESTAB_CONF" }, |
| { GSM48_MT_CC_CONNECT, "CONNECT" }, |
| { GSM48_MT_CC_CALL_CONF, "CALL_CONF" }, |
| { GSM48_MT_CC_START_CC, "START_CC" }, |
| { GSM48_MT_CC_RECALL, "RECALL" }, |
| { GSM48_MT_CC_EMERG_SETUP, "EMERG_SETUP" }, |
| { GSM48_MT_CC_CONNECT_ACK, "CONNECT_ACK" }, |
| { GSM48_MT_CC_USER_INFO, "USER_INFO" }, |
| { GSM48_MT_CC_MODIFY_REJECT, "MODIFY_REJECT" }, |
| { GSM48_MT_CC_MODIFY, "MODIFY" }, |
| { GSM48_MT_CC_HOLD, "HOLD" }, |
| { GSM48_MT_CC_HOLD_ACK, "HOLD_ACK" }, |
| { GSM48_MT_CC_HOLD_REJ, "HOLD_REJ" }, |
| { GSM48_MT_CC_RETR, "RETR" }, |
| { GSM48_MT_CC_RETR_ACK, "RETR_ACK" }, |
| { GSM48_MT_CC_RETR_REJ, "RETR_REJ" }, |
| { GSM48_MT_CC_MODIFY_COMPL, "MODIFY_COMPL" }, |
| { GSM48_MT_CC_DISCONNECT, "DISCONNECT" }, |
| { GSM48_MT_CC_RELEASE_COMPL, "RELEASE_COMPL" }, |
| { GSM48_MT_CC_RELEASE, "RELEASE" }, |
| { GSM48_MT_CC_STOP_DTMF, "STOP_DTMF" }, |
| { GSM48_MT_CC_STOP_DTMF_ACK, "STOP_DTMF_ACK" }, |
| { GSM48_MT_CC_STATUS_ENQ, "STATUS_ENQ" }, |
| { GSM48_MT_CC_START_DTMF, "START_DTMF" }, |
| { GSM48_MT_CC_START_DTMF_ACK, "START_DTMF_ACK" }, |
| { GSM48_MT_CC_START_DTMF_REJ, "START_DTMF_REJ" }, |
| { GSM48_MT_CC_CONG_CTRL, "CONG_CTRL" }, |
| { GSM48_MT_CC_FACILITY, "FACILITY" }, |
| { GSM48_MT_CC_STATUS, "STATUS" }, |
| { GSM48_MT_CC_NOTIFY, "NOTFIY" }, |
| { 0, NULL } |
| }; |
| |
| const char *gsm48_cc_msg_name(uint8_t msgtype) |
| { |
| return get_value_string(cc_msg_names, msgtype); |
| } |
| |
| const char *rr_cause_name(uint8_t cause) |
| { |
| return get_value_string(rr_cause_names, cause); |
| } |
| |
| const struct value_string gsm48_chan_mode_names[] = { |
| { GSM48_CMODE_SIGN, "SIGNALLING" }, |
| { GSM48_CMODE_SPEECH_V1, "SPEECH_V1" }, |
| { GSM48_CMODE_SPEECH_EFR, "SPEECH_EFR" }, |
| { GSM48_CMODE_SPEECH_AMR, "SPEECH_AMR" }, |
| { GSM48_CMODE_DATA_14k5, "DATA_14k5" }, |
| { GSM48_CMODE_DATA_12k0, "DATA_12k0" }, |
| { GSM48_CMODE_DATA_6k0, "DATA_6k0" }, |
| { GSM48_CMODE_DATA_3k6, "DATA_3k6" }, |
| { 0, NULL }, |
| }; |
| |
| const struct value_string gsm_chan_t_names[] = { |
| { GSM_LCHAN_NONE, "NONE" }, |
| { GSM_LCHAN_SDCCH, "SDCCH" }, |
| { GSM_LCHAN_TCH_F, "TCH_F" }, |
| { GSM_LCHAN_TCH_H, "TCH_H" }, |
| { GSM_LCHAN_UNKNOWN, "UNKNOWN" }, |
| { GSM_LCHAN_CCCH, "CCCH" }, |
| { GSM_LCHAN_PDTCH, "PDTCH" }, |
| { GSM_LCHAN_CBCH, "CBCH" }, |
| { 0, NULL }, |
| }; |
| |
| static const struct value_string mi_type_names[] = { |
| { GSM_MI_TYPE_NONE, "NONE" }, |
| { GSM_MI_TYPE_IMSI, "IMSI" }, |
| { GSM_MI_TYPE_IMEI, "IMEI" }, |
| { GSM_MI_TYPE_IMEISV, "IMEI-SV" }, |
| { GSM_MI_TYPE_TMSI, "TMSI" }, |
| { 0, NULL } |
| }; |
| |
| const char *gsm48_mi_type_name(uint8_t mi) |
| { |
| return get_value_string(mi_type_names, mi); |
| } |
| |
| static void to_bcd(uint8_t *bcd, uint16_t val) |
| { |
| bcd[2] = val % 10; |
| val = val / 10; |
| bcd[1] = val % 10; |
| val = val / 10; |
| bcd[0] = val % 10; |
| val = val / 10; |
| } |
| |
| /*! \brief Checks is particular message is cipherable in A/Gb mode according to |
| * 3GPP TS 24.008 § 4.7.1.2 |
| * \param[in] hdr Message header |
| * \return true if message can be encrypted, false otherwise |
| */ |
| bool gsm48_hdr_gmm_cipherable(const struct gsm48_hdr *hdr) |
| { |
| switch(hdr->msg_type) { |
| case GSM48_MT_GMM_ATTACH_REQ: |
| case GSM48_MT_GMM_ATTACH_REJ: |
| case GSM48_MT_GMM_AUTH_CIPH_REQ: |
| case GSM48_MT_GMM_AUTH_CIPH_RESP: |
| case GSM48_MT_GMM_AUTH_CIPH_REJ: |
| case GSM48_MT_GMM_AUTH_CIPH_FAIL: |
| case GSM48_MT_GMM_ID_REQ: |
| case GSM48_MT_GMM_ID_RESP: |
| case GSM48_MT_GMM_RA_UPD_REQ: |
| case GSM48_MT_GMM_RA_UPD_REJ: |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| /* Convert given mcc and mnc to BCD and write to *bcd_dst, which must be an |
| * allocated buffer of (at least) 3 bytes length. */ |
| void gsm48_mcc_mnc_to_bcd(uint8_t *bcd_dst, uint16_t mcc, uint16_t mnc) |
| { |
| uint8_t bcd[3]; |
| |
| to_bcd(bcd, mcc); |
| bcd_dst[0] = bcd[0] | (bcd[1] << 4); |
| bcd_dst[1] = bcd[2]; |
| |
| to_bcd(bcd, mnc); |
| /* FIXME: do we need three-digit MNC? See Table 10.5.3 */ |
| if (mnc > 99) { |
| bcd_dst[1] |= bcd[2] << 4; |
| bcd_dst[2] = bcd[0] | (bcd[1] << 4); |
| } else { |
| bcd_dst[1] |= 0xf << 4; |
| bcd_dst[2] = bcd[1] | (bcd[2] << 4); |
| } |
| } |
| |
| /* Convert given 3-byte BCD buffer to integers and write results to *mcc and |
| * *mnc. The first three BCD digits result in the MCC and the remaining ones in |
| * the MNC. */ |
| void gsm48_mcc_mnc_from_bcd(uint8_t *bcd_src, uint16_t *mcc, uint16_t *mnc) |
| { |
| *mcc = (bcd_src[0] & 0x0f) * 100 |
| + (bcd_src[0] >> 4) * 10 |
| + (bcd_src[1] & 0x0f); |
| |
| if ((bcd_src[1] & 0xf0) == 0xf0) { |
| *mnc = (bcd_src[2] & 0x0f) * 10 |
| + (bcd_src[2] >> 4); |
| } else { |
| *mnc = (bcd_src[2] & 0x0f) * 100 |
| + (bcd_src[2] >> 4) * 10 |
| + (bcd_src[1] >> 4); |
| } |
| } |
| |
| void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc, |
| uint16_t mnc, uint16_t lac) |
| { |
| gsm48_mcc_mnc_to_bcd(&lai48->digits[0], mcc, mnc); |
| lai48->lac = htons(lac); |
| } |
| |
| /* Attention: this function returns true integers, not hex! */ |
| int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc, |
| uint16_t *mnc, uint16_t *lac) |
| { |
| gsm48_mcc_mnc_from_bcd(&lai->digits[0], mcc, mnc); |
| *lac = ntohs(lai->lac); |
| return 0; |
| } |
| |
| /*! \brief Set DTX mode in Cell Options IE (3GPP TS 44.018) |
| * \param[in] op Cell Options structure in which DTX parameters will be set |
| * \param[in] full Mode for full-rate channels |
| * \param[in] half Mode for half-rate channels |
| * \param[in] is_bcch Indicates if we should use 10.5.2.3.1 instead of |
| * 10.5.2.3a.2 |
| * |
| * There is no space for separate DTX settings for Full and Half rate channels |
| * in BCCH - in this case full setting is used for both and half parameter is |
| * ignored. |
| */ |
| void gsm48_set_dtx(struct gsm48_cell_options *op, enum gsm48_dtx_mode full, |
| enum gsm48_dtx_mode half, bool is_bcch) |
| { |
| if (is_bcch) { |
| switch (full) { |
| case GSM48_DTX_MAY_BE_USED: |
| op->dtx = 0; |
| return; |
| case GSM48_DTX_SHALL_BE_USED: |
| op->dtx = 1; |
| return; |
| case GSM48_DTX_SHALL_NOT_BE_USED: |
| op->dtx = 2; |
| return; |
| } |
| } else { |
| switch (full) { |
| case GSM48_DTX_MAY_BE_USED: |
| op->dtx = (half == GSM48_DTX_SHALL_BE_USED) ? 3 : 0; |
| op->d = (half == GSM48_DTX_SHALL_NOT_BE_USED) ? 0 : 1; |
| return; |
| case GSM48_DTX_SHALL_BE_USED: |
| op->dtx = (half == GSM48_DTX_MAY_BE_USED) ? 3 : 1; |
| op->d = (half == GSM48_DTX_SHALL_BE_USED) ? 1 : 0; |
| return; |
| case GSM48_DTX_SHALL_NOT_BE_USED: |
| op->dtx = 2; |
| op->d = (half == GSM48_DTX_SHALL_BE_USED) ? 1 : 0; |
| return; |
| } |
| } |
| } |
| |
| int gsm48_generate_mid_from_tmsi(uint8_t *buf, uint32_t tmsi) |
| { |
| uint32_t tmsi_be = htonl(tmsi); |
| |
| buf[0] = GSM48_IE_MOBILE_ID; |
| buf[1] = GSM48_TMSI_LEN; |
| buf[2] = 0xf0 | GSM_MI_TYPE_TMSI; |
| memcpy(&buf[3], &tmsi_be, sizeof(tmsi_be)); |
| |
| return 7; |
| } |
| |
| int gsm48_generate_mid_from_imsi(uint8_t *buf, const char *imsi) |
| { |
| unsigned int length = strlen(imsi), i, off = 0; |
| uint8_t odd = (length & 0x1) == 1; |
| |
| buf[0] = GSM48_IE_MOBILE_ID; |
| buf[2] = osmo_char2bcd(imsi[0]) << 4 | GSM_MI_TYPE_IMSI | (odd << 3); |
| |
| /* if the length is even we will fill half of the last octet */ |
| if (odd) |
| buf[1] = (length + 1) >> 1; |
| else |
| buf[1] = (length + 2) >> 1; |
| |
| for (i = 1; i < buf[1]; ++i) { |
| uint8_t lower, upper; |
| |
| lower = osmo_char2bcd(imsi[++off]); |
| if (!odd && off + 1 == length) |
| upper = 0x0f; |
| else |
| upper = osmo_char2bcd(imsi[++off]) & 0x0f; |
| |
| buf[2 + i] = (upper << 4) | lower; |
| } |
| |
| return 2 + buf[1]; |
| } |
| |
| /* Convert Mobile Identity (10.5.1.4) to string */ |
| int gsm48_mi_to_string(char *string, const int str_len, const uint8_t *mi, |
| const int mi_len) |
| { |
| int i; |
| uint8_t mi_type; |
| char *str_cur = string; |
| uint32_t tmsi; |
| |
| mi_type = mi[0] & GSM_MI_TYPE_MASK; |
| |
| switch (mi_type) { |
| case GSM_MI_TYPE_NONE: |
| break; |
| case GSM_MI_TYPE_TMSI: |
| /* Table 10.5.4.3, reverse generate_mid_from_tmsi */ |
| if (mi_len == GSM48_TMSI_LEN && mi[0] == (0xf0 | GSM_MI_TYPE_TMSI)) { |
| memcpy(&tmsi, &mi[1], 4); |
| tmsi = ntohl(tmsi); |
| return snprintf(string, str_len, "%u", tmsi); |
| } |
| break; |
| case GSM_MI_TYPE_IMSI: |
| case GSM_MI_TYPE_IMEI: |
| case GSM_MI_TYPE_IMEISV: |
| *str_cur++ = osmo_bcd2char(mi[0] >> 4); |
| |
| for (i = 1; i < mi_len; i++) { |
| if (str_cur + 2 >= string + str_len) |
| return str_cur - string; |
| *str_cur++ = osmo_bcd2char(mi[i] & 0xf); |
| /* skip last nibble in last input byte when GSM_EVEN */ |
| if( (i != mi_len-1) || (mi[0] & GSM_MI_ODD)) |
| *str_cur++ = osmo_bcd2char(mi[i] >> 4); |
| } |
| break; |
| default: |
| break; |
| } |
| *str_cur++ = '\0'; |
| |
| return str_cur - string; |
| } |
| |
| void gsm48_parse_ra(struct gprs_ra_id *raid, const uint8_t *buf) |
| { |
| raid->mcc = (buf[0] & 0xf) * 100; |
| raid->mcc += (buf[0] >> 4) * 10; |
| raid->mcc += (buf[1] & 0xf) * 1; |
| |
| /* I wonder who came up with the stupidity of encoding the MNC |
| * differently depending on how many digits its decimal number has! */ |
| if ((buf[1] >> 4) == 0xf) { |
| raid->mnc = (buf[2] & 0xf) * 10; |
| raid->mnc += (buf[2] >> 4) * 1; |
| } else { |
| raid->mnc = (buf[2] & 0xf) * 100; |
| raid->mnc += (buf[2] >> 4) * 10; |
| raid->mnc += (buf[1] >> 4) * 1; |
| } |
| |
| raid->lac = ntohs(*(uint16_t *)(buf + 3)); |
| raid->rac = buf[5]; |
| } |
| |
| int gsm48_construct_ra(uint8_t *buf, const struct gprs_ra_id *raid) |
| { |
| uint16_t mcc = raid->mcc; |
| uint16_t mnc = raid->mnc; |
| uint16_t _lac; |
| |
| buf[0] = ((mcc / 100) % 10) | (((mcc / 10) % 10) << 4); |
| buf[1] = (mcc % 10); |
| |
| /* I wonder who came up with the stupidity of encoding the MNC |
| * differently depending on how many digits its decimal number has! */ |
| if (mnc < 100) { |
| buf[1] |= 0xf0; |
| buf[2] = ((mnc / 10) % 10) | ((mnc % 10) << 4); |
| } else { |
| buf[1] |= (mnc % 10) << 4; |
| buf[2] = ((mnc / 100) % 10) | (((mnc / 10) % 10) << 4); |
| } |
| |
| _lac = htons(raid->lac); |
| memcpy(buf + 3, &_lac, 2); |
| |
| buf[5] = raid->rac; |
| |
| return 6; |
| } |
| |
| /* From Table 10.5.33 of GSM 04.08 */ |
| int gsm48_number_of_paging_subchannels(struct gsm48_control_channel_descr *chan_desc) |
| { |
| unsigned int n_pag_blocks = gsm0502_get_n_pag_blocks(chan_desc); |
| |
| if (chan_desc->ccch_conf == RSL_BCCH_CCCH_CONF_1_C) |
| return OSMO_MAX(1, n_pag_blocks) * (chan_desc->bs_pa_mfrms + 2); |
| else |
| return n_pag_blocks * (chan_desc->bs_pa_mfrms + 2); |
| } |