/* 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 * (C) 2008, 2009 by Holger Hans Peter Freyther * * 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 #include #include #include #include #include #include #include #include #include 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_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); } 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; } void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc, uint16_t mnc, uint16_t lac) { uint8_t bcd[3]; to_bcd(bcd, mcc); lai48->digits[0] = bcd[0] | (bcd[1] << 4); lai48->digits[1] = bcd[2]; to_bcd(bcd, mnc); /* FIXME: do we need three-digit MNC? See Table 10.5.3 */ if (mnc > 99) { lai48->digits[1] |= bcd[2] << 4; lai48->digits[2] = bcd[0] | (bcd[1] << 4); } else { lai48->digits[1] |= 0xf << 4; lai48->digits[2] = bcd[1] | (bcd[2] << 4); } lai48->lac = htons(lac); } /* Attention: this function retunrs true integers, not hex! */ int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc, uint16_t *mnc, uint16_t *lac) { *mcc = (lai->digits[0] & 0x0f) * 100 + (lai->digits[0] >> 4) * 10 + (lai->digits[1] & 0x0f); if ((lai->digits[1] & 0xf0) == 0xf0) { *mnc = (lai->digits[2] & 0x0f) * 10 + (lai->digits[2] >> 4); } else { *mnc = (lai->digits[2] & 0x0f) * 100 + (lai->digits[2] >> 4) * 10 + (lai->digits[1] >> 4); } *lac = ntohs(lai->lac); return 0; } 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); }