/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ /* (C) 2008-2009 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 #include #include #include #include #include #include #include #include #include #include #define GSM48_ALLOC_SIZE 1024 #define GSM48_ALLOC_HEADROOM 128 static const struct tlv_definition rsl_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_KPD_FACILITY] = { TLV_TYPE_TV }, [GSM48_IE_SIGNAL] = { TLV_TYPE_TV }, [GSM48_IE_CONN_NUM] = { TLV_TYPE_TLV }, [GSM48_IE_CONN_SUBADDR] = { 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 }, /* FIXME: more elements */ }, }; static const char *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", }; static char strbuf[64]; static const char *rr_cause_name(u_int8_t cause) { if (cause < ARRAY_SIZE(rr_cause_names) && rr_cause_names[cause]) return rr_cause_names[cause]; snprintf(strbuf, sizeof(strbuf), "0x%02x", cause); return strbuf; } static int gsm48_tx_simple(struct gsm_lchan *lchan, u_int8_t pdisc, u_int8_t msg_type); static void schedule_reject(struct gsm_lchan *lchan); struct gsm_lai { u_int16_t mcc; u_int16_t mnc; u_int16_t lac; }; static int authorize_everonye = 0; void gsm0408_allow_everyone(int everyone) { printf("Allowing everyone?\n"); authorize_everonye = everyone; } static int reject_cause = 0; void gsm0408_set_reject_cause(int cause) { reject_cause = cause; } static int authorize_subscriber(struct gsm_loc_updating_operation *loc, struct gsm_subscriber *subscriber) { if (!subscriber) return 0; /* * Do not send accept yet as more information should arrive. Some * phones will not send us the information and we will have to check * what we want to do with that. */ if (loc && (loc->waiting_for_imsi || loc->waiting_for_imei)) return 0; if (authorize_everonye) return 1; return subscriber->authorized; } static void release_loc_updating_req(struct gsm_lchan *lchan) { if (!lchan->loc_operation) return; bsc_del_timer(&lchan->loc_operation->updating_timer); free(lchan->loc_operation); lchan->loc_operation = 0; put_lchan(lchan); } static void allocate_loc_updating_req(struct gsm_lchan *lchan) { use_lchan(lchan); release_loc_updating_req(lchan); lchan->loc_operation = (struct gsm_loc_updating_operation *) malloc(sizeof(*lchan->loc_operation)); memset(lchan->loc_operation, 0, sizeof(*lchan->loc_operation)); } static void to_bcd(u_int8_t *bcd, u_int16_t val) { bcd[2] = val % 10; val = val / 10; bcd[1] = val % 10; val = val / 10; bcd[0] = val % 10; val = val / 10; } void gsm0408_generate_lai(struct gsm48_loc_area_id *lai48, u_int16_t mcc, u_int16_t mnc, u_int16_t lac) { u_int8_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 0 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); #endif lai48->lac = htons(lac); } #define TMSI_LEN 5 #define MID_TMSI_LEN (TMSI_LEN + 2) int generate_mid_from_tmsi(u_int8_t *buf, u_int32_t tmsi) { u_int32_t *tptr = (u_int32_t *) &buf[3]; buf[0] = GSM48_IE_MOBILE_ID; buf[1] = TMSI_LEN; buf[2] = 0xf0 | GSM_MI_TYPE_TMSI; *tptr = htonl(tmsi); return 7; } static const char bcd_num_digits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '*', '#', 'a', 'b', 'c', '\0' }; /* decode a 'called party BCD number' as in 10.5.4.7 */ u_int8_t decode_bcd_number(char *output, int output_len, const u_int8_t *bcd_lv) { u_int8_t in_len = bcd_lv[0]; int i; if (in_len < 1) return 0; for (i = 2; i <= in_len; i++) { /* lower nibble */ output_len--; if (output_len <= 1) break; *output++ = bcd_num_digits[bcd_lv[i] & 0xf]; /* higher nibble */ output_len--; if (output_len <= 1) break; *output++ = bcd_num_digits[bcd_lv[i] >> 4]; } if (output_len >= 1) *output++ = '\0'; /* return number type / calling plan */ return bcd_lv[1] & 0x3f; } /* convert a single ASCII character to call-control BCD */ static int asc_to_bcd(const char asc) { int i; for (i = 0; i < ARRAY_SIZE(bcd_num_digits); i++) { if (bcd_num_digits[i] == asc) return i; } return -EINVAL; } /* convert a ASCII phone number to 'called party BCD number' */ int encode_bcd_number(u_int8_t *bcd_lv, u_int8_t max_len, u_int8_t type, const char *input) { int in_len = strlen(input); int i; u_int8_t *bcd_cur = bcd_lv + 2; if (in_len/2 + 1 > max_len) return -EIO; /* two digits per byte, plus type byte */ bcd_lv[0] = in_len/2 + 1; if (in_len % 2) bcd_lv[0]++; /* if the caller wants to create a valid 'calling party BCD * number', then the extension bit MUST NOT be set. For the * 'called party BCD number' it MUST be set. *sigh */ bcd_lv[1] = type; for (i = 0; i < in_len; i++) { int rc = asc_to_bcd(input[i]); if (rc < 0) return rc; if (i % 2 == 0) *bcd_cur = rc; else *bcd_cur++ |= (rc << 4); } /* append padding nibble in case of odd length */ if (i % 2) *bcd_cur++ |= 0xf0; /* return how many bytes we used */ return (bcd_cur - bcd_lv); } struct msgb *gsm48_msgb_alloc(void) { return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM); } int gsm48_sendmsg(struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data; if (msg->lchan) { msg->trx = msg->lchan->ts->trx; if ((gh->proto_discr & GSM48_PDISC_MASK) == GSM48_PDISC_CC) { /* Send a 04.08 call control message, add transaction * ID and TI flag */ gh->proto_discr |= msg->lchan->call.transaction_id; /* GSM 04.07 Section 11.2.3.1.3 */ switch (msg->lchan->call.type) { case GSM_CT_MO: gh->proto_discr |= 0x80; break; case GSM_CT_MT: break; case GSM_CT_NONE: break; } } } msg->l3h = msg->data; return rsl_data_request(msg, 0); } /* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */ int gsm0408_loc_upd_rej(struct gsm_lchan *lchan, u_int8_t cause) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; msg->lchan = lchan; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM; gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT; gh->data[0] = cause; DEBUGP(DMM, "-> LOCATION UPDATING REJECT on channel: %d\n", lchan->nr); return gsm48_sendmsg(msg); } /* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */ int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int32_t tmsi) { struct gsm_bts *bts = lchan->ts->trx->bts; struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; struct gsm48_loc_area_id *lai; u_int8_t *mid; int ret; msg->lchan = lchan; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM; gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai)); gsm0408_generate_lai(lai, bts->network->country_code, bts->network->network_code, bts->location_area_code); mid = msgb_put(msg, MID_TMSI_LEN); generate_mid_from_tmsi(mid, tmsi); DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n"); ret = gsm48_sendmsg(msg); ret = gsm48_tx_mm_info(lchan); return ret; } static char bcd2char(u_int8_t bcd) { if (bcd < 0xa) return '0' + bcd; else return 'A' + (bcd - 0xa); } /* Convert Mobile Identity (10.5.1.4) to string */ static int mi_to_string(char *string, int str_len, u_int8_t *mi, int mi_len) { int i; u_int8_t mi_type; char *str_cur = string; u_int32_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 == 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++ = bcd2char(mi[0] >> 4); for (i = 1; i < mi_len; i++) { if (str_cur + 2 >= string + str_len) return str_cur - string; *str_cur++ = 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++ = bcd2char(mi[i] >> 4); } break; default: break; } *str_cur++ = '\0'; return str_cur - string; } /* Transmit Chapter 9.2.10 Identity Request */ static int mm_tx_identity_req(struct gsm_lchan *lchan, u_int8_t id_type) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; msg->lchan = lchan; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM; gh->msg_type = GSM48_MT_MM_ID_REQ; gh->data[0] = id_type; return gsm48_sendmsg(msg); } #define MI_SIZE 32 /* Parse Chapter 9.2.11 Identity Response */ static int mm_rx_id_resp(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); struct gsm_lchan *lchan = msg->lchan; u_int8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK; char mi_string[MI_SIZE]; u_int32_t tmsi; mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]); DEBUGP(DMM, "IDENTITY RESPONSE: mi_type=0x%02x MI(%s)\n", mi_type, mi_string); /* * Rogue messages could trick us but so is life */ put_lchan(lchan); switch (mi_type) { case GSM_MI_TYPE_IMSI: if (!lchan->subscr) lchan->subscr = db_create_subscriber(mi_string); if (lchan->loc_operation) lchan->loc_operation->waiting_for_imsi = 0; break; case GSM_MI_TYPE_IMEI: case GSM_MI_TYPE_IMEISV: /* update subscribe <-> IMEI mapping */ if (lchan->subscr) db_subscriber_assoc_imei(lchan->subscr, mi_string); if (lchan->loc_operation) lchan->loc_operation->waiting_for_imei = 0; break; } /* Check if we can let the mobile station enter */ if (authorize_subscriber(lchan->loc_operation, lchan->subscr)) { db_subscriber_alloc_tmsi(lchan->subscr); tmsi = strtoul(lchan->subscr->tmsi, NULL, 10); release_loc_updating_req(lchan); return gsm0408_loc_upd_acc(msg->lchan, tmsi); } return 0; } static void loc_upd_rej_cb(void *data) { struct gsm_lchan *lchan = data; release_loc_updating_req(lchan); gsm0408_loc_upd_rej(lchan, reject_cause); lchan_auto_release(lchan); } static void schedule_reject(struct gsm_lchan *lchan) { lchan->loc_operation->updating_timer.cb = loc_upd_rej_cb; lchan->loc_operation->updating_timer.data = lchan; bsc_schedule_timer(&lchan->loc_operation->updating_timer, 5, 0); } static const char *lupd_name(u_int8_t type) { switch (type) { case GSM48_LUPD_NORMAL: return "NORMAL"; case GSM48_LUPD_PERIODIC: return "PEROIDOC"; case GSM48_LUPD_IMSI_ATT: return "IMSI ATTACH"; default: return "UNKNOWN"; } } #define MI_SIZE 32 /* Chapter 9.2.15: Receive Location Updating Request */ static int mm_rx_loc_upd_req(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); struct gsm_bts *bts = msg->trx->bts; struct gsm48_loc_upd_req *lu; struct gsm_subscriber *subscr; struct gsm_lchan *lchan = msg->lchan; u_int8_t mi_type; u_int32_t tmsi; char mi_string[MI_SIZE]; int rc; lu = (struct gsm48_loc_upd_req *) gh->data; mi_type = lu->mi[0] & GSM_MI_TYPE_MASK; mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len); DEBUGP(DMM, "LUPDREQ: mi_type=0x%02x MI(%s) type=%s\n", mi_type, mi_string, lupd_name(lu->type)); allocate_loc_updating_req(lchan); switch (mi_type) { case GSM_MI_TYPE_IMSI: /* we always want the IMEI, too */ use_lchan(lchan); rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEI); lchan->loc_operation->waiting_for_imei = 1; /* look up subscriber based on IMSI */ subscr = db_create_subscriber(mi_string); break; case GSM_MI_TYPE_TMSI: /* we always want the IMEI, too */ use_lchan(lchan); rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEI); lchan->loc_operation->waiting_for_imei = 1; /* look up the subscriber based on TMSI, request IMSI if it fails */ subscr = subscr_get_by_tmsi(mi_string); if (!subscr) { /* send IDENTITY REQUEST message to get IMSI */ use_lchan(lchan); rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMSI); lchan->loc_operation->waiting_for_imsi = 1; } break; case GSM_MI_TYPE_IMEI: case GSM_MI_TYPE_IMEISV: /* no sim card... FIXME: what to do ? */ DEBUGP(DMM, "unimplemented mobile identity type\n"); break; default: DEBUGP(DMM, "unknown mobile identity type\n"); break; } lchan->subscr = subscr; /* * Schedule the reject timer and check if we can let the * subscriber into our network immediately or if we need to wait * for identity responses. */ schedule_reject(lchan); if (!authorize_subscriber(lchan->loc_operation, subscr)) return 0; db_subscriber_alloc_tmsi(subscr); subscr_update(subscr, bts, GSM_SUBSCRIBER_UPDATE_ATTACHED); tmsi = strtoul(subscr->tmsi, NULL, 10); release_loc_updating_req(lchan); return gsm0408_loc_upd_acc(lchan, tmsi); } /* 9.1.5 Channel mode modify */ int gsm48_tx_chan_mode_modify(struct gsm_lchan *lchan, u_int8_t mode) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); struct gsm48_chan_mode_modify *cmm = (struct gsm48_chan_mode_modify *) msgb_put(msg, sizeof(*cmm)); u_int16_t arfcn = lchan->ts->trx->arfcn & 0x3ff; DEBUGP(DRR, "-> CHANNEL MODE MODIFY mode=0x%02x\n", mode); lchan->tch_mode = mode; msg->lchan = lchan; gh->proto_discr = GSM48_PDISC_RR; gh->msg_type = GSM48_MT_RR_CHAN_MODE_MODIF; /* fill the channel information element, this code * should probably be shared with rsl_rx_chan_rqd() */ cmm->chan_desc.chan_nr = lchan2chan_nr(lchan); cmm->chan_desc.h0.tsc = lchan->ts->trx->bts->tsc; cmm->chan_desc.h0.h = 0; cmm->chan_desc.h0.arfcn_high = arfcn >> 8; cmm->chan_desc.h0.arfcn_low = arfcn & 0xff; cmm->mode = mode; return gsm48_sendmsg(msg); } /* Section 9.2.15a */ int gsm48_tx_mm_info(struct gsm_lchan *lchan) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; struct gsm_network *net = lchan->ts->trx->bts->network; u_int8_t *ptr8; u_int16_t *ptr16; int name_len; int i; msg->lchan = lchan; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM; gh->msg_type = GSM48_MT_MM_INFO; if (net->name_long) { name_len = strlen(net->name_long); /* 10.5.3.5a */ ptr8 = msgb_put(msg, 3); ptr8[0] = GSM48_IE_NAME_LONG; ptr8[1] = name_len*2 +1; ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */ ptr16 = (u_int16_t *) msgb_put(msg, name_len*2); for (i = 0; i < name_len; i++) ptr16[i] = htons(net->name_long[i]); /* FIXME: Use Cell Broadcast, not UCS-2, since * UCS-2 is only supported by later revisions of the spec */ } if (net->name_short) { name_len = strlen(net->name_short); /* 10.5.3.5a */ ptr8 = (u_int8_t *) msgb_put(msg, 3); ptr8[0] = GSM48_IE_NAME_LONG; ptr8[1] = name_len*2 + 1; ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */ ptr16 = (u_int16_t *) msgb_put(msg, name_len*2); for (i = 0; i < name_len; i++) ptr16[i] = htons(net->name_short[i]); } #if 0 /* move back to the top */ time_t cur_t; struct tm* cur_time; int tz15min; /* Section 10.5.3.9 */ cur_t = time(NULL); cur_time = gmtime(cur_t); ptr8 = msgb_put(msg, 8); ptr8[0] = GSM48_IE_NET_TIME_TZ; ptr8[1] = to_bcd8(cur_time->tm_year % 100); ptr8[2] = to_bcd8(cur_time->tm_mon); ptr8[3] = to_bcd8(cur_time->tm_mday); ptr8[4] = to_bcd8(cur_time->tm_hour); ptr8[5] = to_bcd8(cur_time->tm_min); ptr8[6] = to_bcd8(cur_time->tm_sec); /* 02.42: coded as BCD encoded signed value in units of 15 minutes */ tz15min = (cur_time->tm_gmtoff)/(60*15); ptr8[6] = to_bcd8(tz15min); if (tz15min < 0) ptr8[6] |= 0x80; #endif return gsm48_sendmsg(msg); } static int gsm48_tx_mm_serv_ack(struct gsm_lchan *lchan) { DEBUGP(DMM, "-> CM SERVICE ACK\n"); return gsm48_tx_simple(lchan, GSM48_PDISC_MM, GSM48_MT_MM_CM_SERV_ACC); } /* 9.2.6 CM service reject */ static int gsm48_tx_mm_serv_rej(struct gsm_lchan *lchan, enum gsm48_reject_value value) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); msg->lchan = lchan; use_lchan(lchan); gh->proto_discr = GSM48_PDISC_MM; gh->msg_type = GSM48_MT_MM_CM_SERV_REJ; gh->data[0] = value; DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value); return gsm48_sendmsg(msg); } /* * Handle CM Service Requests * a) Verify that the packet is long enough to contain the information * we require otherwsie reject with INCORRECT_MESSAGE * b) Try to parse the TMSI. If we do not have one reject * c) Check that we know the subscriber with the TMSI otherwise reject * with a HLR cause * d) Set the subscriber on the gsm_lchan and accept */ static int gsm48_rx_mm_serv_req(struct msgb *msg) { u_int8_t mi_type; char mi_string[MI_SIZE]; struct gsm_subscriber *subscr; struct gsm48_hdr *gh = msgb_l3(msg); struct gsm48_service_request *req = (struct gsm48_service_request *)gh->data; /* unfortunately in Phase1 the classmar2 length is variable */ u_int8_t classmark2_len = gh->data[1]; u_int8_t *classmark2 = gh->data+2; u_int8_t mi_len = *(classmark2 + classmark2_len); u_int8_t *mi = (classmark2 + classmark2_len + 1); DEBUGP(DMM, "<- CM SERVICE REQUEST "); if (msg->data_len < sizeof(struct gsm48_service_request*)) { DEBUGPC(DMM, "wrong sized message\n"); return gsm48_tx_mm_serv_rej(msg->lchan, GSM48_REJECT_INCORRECT_MESSAGE); } if (msg->data_len < req->mi_len + 6) { DEBUGPC(DMM, "does not fit in packet\n"); return gsm48_tx_mm_serv_rej(msg->lchan, GSM48_REJECT_INCORRECT_MESSAGE); } mi_type = mi[0] & GSM_MI_TYPE_MASK; if (mi_type != GSM_MI_TYPE_TMSI) { DEBUGPC(DMM, "mi_type is not TMSI: %d\n", mi_type); return gsm48_tx_mm_serv_rej(msg->lchan, GSM48_REJECT_INCORRECT_MESSAGE); } mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); subscr = subscr_get_by_tmsi(mi_string); DEBUGPC(DMM, "serv_type=0x%02x mi_type=0x%02x M(%s)\n", req->cm_service_type, mi_type, mi_string); /* FIXME: if we don't know the TMSI, inquire abit IMSI and allocate new TMSI */ if (!subscr) return gsm48_tx_mm_serv_rej(msg->lchan, GSM48_REJECT_IMSI_UNKNOWN_IN_HLR); if (!msg->lchan->subscr) msg->lchan->subscr = subscr; else if (msg->lchan->subscr != subscr) { DEBUGP(DMM, "<- CM Channel already owned by someone else?\n"); subscr_put(subscr); } return gsm48_tx_mm_serv_ack(msg->lchan); } static int gsm48_rx_mm_imsi_detach_ind(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); struct gsm48_imsi_detach_ind *idi = (struct gsm48_imsi_detach_ind *) gh->data; u_int8_t mi_type = idi->mi[0] & GSM_MI_TYPE_MASK; char mi_string[MI_SIZE]; struct gsm_subscriber *subscr; mi_to_string(mi_string, sizeof(mi_string), idi->mi, idi->mi_len); DEBUGP(DMM, "IMSI DETACH INDICATION: mi_type=0x%02x MI(%s): ", mi_type, mi_string); switch (mi_type) { case GSM_MI_TYPE_TMSI: subscr = subscr_get_by_tmsi(mi_string); break; case GSM_MI_TYPE_IMSI: subscr = subscr_get_by_imsi(mi_string); break; case GSM_MI_TYPE_IMEI: case GSM_MI_TYPE_IMEISV: /* no sim card... FIXME: what to do ? */ DEBUGPC(DMM, "unimplemented mobile identity type\n"); break; default: DEBUGPC(DMM, "unknown mobile identity type\n"); break; } if (subscr) { subscr_update(subscr, msg->trx->bts, GSM_SUBSCRIBER_UPDATE_DETACHED); DEBUGP(DMM, "Subscriber: %s\n", subscr->name ? subscr->name : subscr->imsi); subscr_put(subscr); } else DEBUGP(DMM, "Unknown Subscriber ?!?\n"); put_lchan(msg->lchan); return 0; } /* Receive a GSM 04.08 Mobility Management (MM) message */ static int gsm0408_rcv_mm(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); int rc; switch (gh->msg_type & 0xbf) { case GSM48_MT_MM_LOC_UPD_REQUEST: DEBUGP(DMM, "LOCATION UPDATING REQUEST\n"); rc = mm_rx_loc_upd_req(msg); break; case GSM48_MT_MM_ID_RESP: rc = mm_rx_id_resp(msg); break; case GSM48_MT_MM_CM_SERV_REQ: rc = gsm48_rx_mm_serv_req(msg); break; case GSM48_MT_MM_STATUS: DEBUGP(DMM, "STATUS: FIXME parse error cond.\n"); break; case GSM48_MT_MM_TMSI_REALL_COMPL: DEBUGP(DMM, "TMSI Reallocation Completed. Subscriber: %s\n", msg->lchan->subscr ? msg->lchan->subscr->imsi : "unknown subscriber"); break; case GSM48_MT_MM_IMSI_DETACH_IND: rc = gsm48_rx_mm_imsi_detach_ind(msg); break; case GSM48_MT_MM_CM_REEST_REQ: DEBUGP(DMM, "CM REESTABLISH REQUEST: Not implemented\n"); break; case GSM48_MT_MM_AUTH_RESP: DEBUGP(DMM, "AUTHENTICATION RESPONSE: Not implemented\n"); break; default: fprintf(stderr, "Unknown GSM 04.08 MM msg type 0x%02x\n", gh->msg_type); break; } return rc; } /* Receive a PAGING RESPONSE message from the MS */ static int gsm48_rr_rx_pag_resp(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); u_int8_t *classmark2_lv = gh->data + 1; u_int8_t *mi_lv = gh->data + 2 + *classmark2_lv; u_int8_t mi_type = mi_lv[1] & GSM_MI_TYPE_MASK; char mi_string[MI_SIZE]; struct gsm_subscriber *subscr; struct paging_signal_data sig_data; int rc = 0; mi_to_string(mi_string, sizeof(mi_string), mi_lv+1, *mi_lv); DEBUGP(DRR, "PAGING RESPONSE: mi_type=0x%02x MI(%s)\n", mi_type, mi_string); switch (mi_type) { case GSM_MI_TYPE_TMSI: subscr = subscr_get_by_tmsi(mi_string); break; case GSM_MI_TYPE_IMSI: subscr = subscr_get_by_imsi(mi_string); break; } if (!subscr) { DEBUGP(DRR, "<- Can't find any subscriber for this ID\n"); /* FIXME: request id? close channel? */ return -EINVAL; } DEBUGP(DRR, "<- Channel was requested by %s\n", subscr->name ? subscr->name : subscr->imsi); if (!msg->lchan->subscr) { msg->lchan->subscr = subscr; } else if (msg->lchan->subscr != subscr) { DEBUGP(DRR, "<- Channel already owned by someone else?\n"); subscr_put(subscr); return -EINVAL; } else { DEBUGP(DRR, "<- Channel already owned by us\n"); subscr_put(subscr); subscr = msg->lchan->subscr; } sig_data.subscr = subscr; sig_data.bts = msg->lchan->ts->trx->bts; sig_data.lchan = msg->lchan; dispatch_signal(SS_PAGING, S_PAGING_COMPLETED, &sig_data); paging_request_stop(msg->trx->bts, subscr, msg->lchan); /* FIXME: somehow signal the completion of the PAGING to * the entity that requested the paging */ return rc; } static int gsm48_rx_rr_status(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); DEBUGP(DRR, "STATUS rr_cause = %s\n", rr_cause_name(gh->data[0])); return 0; } /* Receive a GSM 04.08 Radio Resource (RR) message */ static int gsm0408_rcv_rr(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); int rc = 0; switch (gh->msg_type) { case GSM48_MT_RR_CLSM_CHG: DEBUGP(DRR, "CLASSMARK CHANGE\n"); /* FIXME: what to do ?!? */ break; case GSM48_MT_RR_GPRS_SUSP_REQ: DEBUGP(DRR, "GRPS SUSPEND REQUEST\n"); break; case GSM48_MT_RR_PAG_RESP: rc = gsm48_rr_rx_pag_resp(msg); break; case GSM48_MT_RR_CHAN_MODE_MODIF_ACK: DEBUGP(DRR, "CHANNEL MODE MODIFY ACK\n"); rc = rsl_chan_mode_modify_req(msg->lchan); break; case GSM48_MT_RR_STATUS: rc = gsm48_rx_rr_status(msg); break; default: fprintf(stderr, "Unimplemented GSM 04.08 RR msg type 0x%02x\n", gh->msg_type); break; } return rc; } /* 7.1.7 and 9.1.7 Channel release*/ int gsm48_send_rr_release(struct gsm_lchan *lchan) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); u_int8_t *cause; msg->lchan = lchan; gh->proto_discr = GSM48_PDISC_RR; gh->msg_type = GSM48_MT_RR_CHAN_REL; cause = msgb_put(msg, 1); cause[0] = GSM48_RR_CAUSE_NORMAL; DEBUGP(DRR, "Sending Channel Release: Chan: Number: %d Type: %d\n", lchan->nr, lchan->type); return gsm48_sendmsg(msg); } /* Call Control */ /* The entire call control code is written in accordance with Figure 7.10c * for 'very early assignment', i.e. we allocate a TCH/F during IMMEDIATE * ASSIGN, then first use that TCH/F for signalling and later MODE MODIFY * it for voice */ static int gsm48_cc_tx_status(struct gsm_lchan *lchan) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); u_int8_t *cause, *call_state; gh->proto_discr = GSM48_PDISC_CC; msg->lchan = lchan; gh->msg_type = GSM48_MT_CC_STATUS; cause = msgb_put(msg, 3); cause[0] = 2; cause[1] = GSM48_CAUSE_CS_GSM | GSM48_CAUSE_LOC_USER; cause[2] = 0x80 | 30; /* response to status inquiry */ call_state = msgb_put(msg, 1); call_state[0] = 0xc0 | 0x00; return gsm48_sendmsg(msg); } static int gsm48_tx_simple(struct gsm_lchan *lchan, u_int8_t pdisc, u_int8_t msg_type) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); msg->lchan = lchan; gh->proto_discr = pdisc; gh->msg_type = msg_type; return gsm48_sendmsg(msg); } /* call-back from paging the B-end of the connection */ static int setup_trig_pag_evt(unsigned int hooknum, unsigned int event, struct msgb *msg, void *_lchan, void *param) { struct gsm_lchan *lchan = _lchan; struct gsm_call *remote_call = param; struct gsm_call *call = &lchan->call; int rc = 0; if (hooknum != GSM_HOOK_RR_PAGING) return -EINVAL; switch (event) { case GSM_PAGING_SUCCEEDED: DEBUGP(DCC, "paging succeeded!\n"); remote_call->remote_lchan = lchan; call->remote_lchan = remote_call->local_lchan; /* send SETUP request to called party */ rc = gsm48_cc_tx_setup(lchan, call->remote_lchan->subscr); if (is_ipaccess_bts(lchan->ts->trx->bts)) rsl_ipacc_bind(lchan); break; case GSM_PAGING_EXPIRED: DEBUGP(DCC, "paging expired!\n"); /* notify caller that we cannot reach called party */ /* FIXME: correct cause, etc */ rc = gsm48_tx_simple(remote_call->local_lchan, GSM48_PDISC_CC, GSM48_MT_CC_RELEASE_COMPL); break; } return rc; } static int gsm48_cc_rx_status_enq(struct msgb *msg) { DEBUGP(DCC, "-> STATUS ENQ\n"); return gsm48_cc_tx_status(msg->lchan); } static int gsm48_cc_rx_setup(struct msgb *msg) { struct gsm_call *call = &msg->lchan->call; struct gsm48_hdr *gh = msgb_l3(msg); unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); struct gsm_subscriber *called_subscr; char called_number[(43-2)*2 + 1] = "\0"; struct tlv_parsed tp; u_int8_t num_type; int ret; if (call->state == GSM_CSTATE_NULL || call->state == GSM_CSTATE_RELEASE_REQ) use_lchan(msg->lchan); call->type = GSM_CT_MO; call->state = GSM_CSTATE_INITIATED; call->local_lchan = msg->lchan; call->transaction_id = gh->proto_discr & 0xf0; tlv_parse(&tp, &rsl_att_tlvdef, gh->data, payload_len, 0, 0); if (!TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) goto err; /* Parse the number that was dialed and lookup subscriber */ num_type = decode_bcd_number(called_number, sizeof(called_number), TLVP_VAL(&tp, GSM48_IE_CALLED_BCD)-1); DEBUGP(DCC, "A -> SETUP(tid=0x%02x,number='%s')\n", call->transaction_id, called_number); called_subscr = subscr_get_by_extension(called_number); if (!called_subscr) { DEBUGP(DCC, "could not find subscriber, RELEASE\n"); put_lchan(msg->lchan); return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_RELEASE_COMPL); } if (called_subscr == msg->lchan->subscr) { DEBUGP(DCC, "subscriber calling himself ?!?\n"); put_lchan(msg->lchan); subscr_put(called_subscr); return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_RELEASE_COMPL); } subscr_get(msg->lchan->subscr); call->called_subscr = called_subscr; /* start paging of the receiving end of the call */ /* FIXME: we're assuming that the receiver is at the same BTS * than we are, which is obviously a wrong assumption in multi-BTS * case */ paging_request(msg->trx->bts, called_subscr, RSL_CHANNEED_TCH_F, setup_trig_pag_evt, call); /* send a CALL PROCEEDING message to the MO */ ret = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_CALL_PROC); if (is_ipaccess_bts(msg->trx->bts)) rsl_ipacc_bind(msg->lchan); /* change TCH/F mode to voice */ return gsm48_tx_chan_mode_modify(msg->lchan, GSM48_CMODE_SPEECH_EFR); err: /* FIXME: send some kind of RELEASE */ return 0; } static int gsm48_cc_rx_alerting(struct msgb *msg) { struct gsm_call *call = &msg->lchan->call; DEBUGP(DCC, "A -> ALERTING\n"); /* forward ALERTING to other party */ if (!call->remote_lchan) return -EIO; DEBUGP(DCC, "B <- ALERTING\n"); return gsm48_tx_simple(call->remote_lchan, GSM48_PDISC_CC, GSM48_MT_CC_ALERTING); } /* map two ipaccess RTP streams onto each other */ static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan) { struct gsm_bts *bts = lchan->ts->trx->bts; struct gsm_bts *remote_bts = remote_lchan->ts->trx->bts; struct gsm_bts_trx_ts *ts; DEBUGP(DCC, "Setting up TCH map between (bts=%u,trx=%u,ts=%u) and (bts=%u,trx=%u,ts=%u)\n", bts->nr, lchan->ts->trx->nr, lchan->ts->nr, remote_bts->nr, remote_lchan->ts->trx->nr, remote_lchan->ts->nr); if (bts->type != remote_bts->type) { DEBUGP(DCC, "Cannot switch calls between different BTS types yet\n"); return -EINVAL; } switch (bts->type) { case GSM_BTS_TYPE_NANOBTS_900: case GSM_BTS_TYPE_NANOBTS_1800: ts = remote_lchan->ts; rsl_ipacc_connect(lchan, ts->abis_ip.bound_ip, ts->abis_ip.bound_port, lchan->ts->abis_ip.attr_f8, ts->abis_ip.attr_fc); ts = lchan->ts; rsl_ipacc_connect(remote_lchan, ts->abis_ip.bound_ip, ts->abis_ip.bound_port, remote_lchan->ts->abis_ip.attr_f8, ts->abis_ip.attr_fc); break; case GSM_BTS_TYPE_BS11: trau_mux_map_lchan(lchan, remote_lchan); break; default: DEBUGP(DCC, "Unknown BTS type %u\n", bts->type); break; } return 0; } static int gsm48_cc_rx_connect(struct msgb *msg) { struct gsm_call *call = &msg->lchan->call; int rc; DEBUGP(DCC, "A -> CONNECT\n"); rc = tch_map(msg->lchan, call->remote_lchan); if (rc) return -EIO; if (!call->remote_lchan) return -EIO; DEBUGP(DCC, "A <- CONNECT ACK\n"); /* MT+MO: need to respond with CONNECT_ACK and pass on */ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_CONNECT_ACK); /* forward CONNECT to other party */ DEBUGP(DCC, "B <- CONNECT\n"); return gsm48_tx_simple(call->remote_lchan, GSM48_PDISC_CC, GSM48_MT_CC_CONNECT); } static int gsm48_cc_rx_disconnect(struct msgb *msg) { struct gsm_call *call = &msg->lchan->call; int rc; /* Section 5.4.3.2 */ DEBUGP(DCC, "A -> DISCONNECT (state->RELEASE_REQ)\n"); call->state = GSM_CSTATE_RELEASE_REQ; /* FIXME: clear the network connection */ DEBUGP(DCC, "A <- RELEASE\n"); rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_RELEASE); /* * FIXME: This looks wrong! We should have a single * place to do MMCC-REL-CNF/-REQ/-IND and then switch * to the NULL state and relase the call */ subscr_put_channel(msg->lchan); /* forward DISCONNECT to other party */ if (!call->remote_lchan) return -EIO; DEBUGP(DCC, "B <- DISCONNECT\n"); return gsm48_tx_simple(call->remote_lchan, GSM48_PDISC_CC, GSM48_MT_CC_DISCONNECT); } static const u_int8_t calling_bcd[] = { 0xb9, 0x32, 0x24 }; int gsm48_cc_tx_setup(struct gsm_lchan *lchan, struct gsm_subscriber *calling_subscr) { struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; struct gsm_call *call = &lchan->call; u_int8_t bcd_lv[19]; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); call->type = GSM_CT_MT; call->local_lchan = msg->lchan = lchan; use_lchan(lchan); gh->proto_discr = GSM48_PDISC_CC; gh->msg_type = GSM48_MT_CC_SETUP; msgb_tv_put(msg, GSM48_IE_SIGNAL, GSM48_SIGNAL_DIALTONE); if (calling_subscr) { encode_bcd_number(bcd_lv, sizeof(bcd_lv), 0xb9, calling_subscr->extension); msgb_tlv_put(msg, GSM48_IE_CALLING_BCD, bcd_lv[0], bcd_lv+1); } if (lchan->subscr) { encode_bcd_number(bcd_lv, sizeof(bcd_lv), 0xb9, lchan->subscr->extension); msgb_tlv_put(msg, GSM48_IE_CALLED_BCD, bcd_lv[0], bcd_lv+1); } DEBUGP(DCC, "B <- SETUP\n"); return gsm48_sendmsg(msg); } static int gsm0408_rcv_cc(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); u_int8_t msg_type = gh->msg_type & 0xbf; struct gsm_call *call = &msg->lchan->call; int rc = 0; switch (msg_type) { case GSM48_MT_CC_CALL_CONF: /* Response to SETUP */ DEBUGP(DCC, "-> CALL CONFIRM\n"); /* we now need to MODIFY the channel */ rc = gsm48_tx_chan_mode_modify(msg->lchan, GSM48_CMODE_SPEECH_EFR); break; case GSM48_MT_CC_RELEASE_COMPL: /* Answer from MS to RELEASE */ DEBUGP(DCC, "-> RELEASE COMPLETE (state->NULL)\n"); call->state = GSM_CSTATE_NULL; break; case GSM48_MT_CC_ALERTING: rc = gsm48_cc_rx_alerting(msg); break; case GSM48_MT_CC_CONNECT: rc = gsm48_cc_rx_connect(msg); break; case GSM48_MT_CC_CONNECT_ACK: /* MO: Answer to CONNECT */ call->state = GSM_CSTATE_ACTIVE; DEBUGP(DCC, "-> CONNECT_ACK (state->ACTIVE)\n"); break; case GSM48_MT_CC_RELEASE: DEBUGP(DCC, "-> RELEASE\n"); DEBUGP(DCC, "<- RELEASE_COMPLETE\n"); /* need to respond with RELEASE_COMPLETE */ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_RELEASE_COMPL); subscr_put_channel(msg->lchan); call->state = GSM_CSTATE_NULL; break; case GSM48_MT_CC_STATUS_ENQ: rc = gsm48_cc_rx_status_enq(msg); break; case GSM48_MT_CC_DISCONNECT: rc = gsm48_cc_rx_disconnect(msg); break; case GSM48_MT_CC_SETUP: /* MO: wants to establish a call */ rc = gsm48_cc_rx_setup(msg); break; case GSM48_MT_CC_EMERG_SETUP: DEBUGP(DCC, "-> EMERGENCY SETUP\n"); /* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */ break; case GSM48_MT_CC_HOLD: DEBUGP(DCC, "-> HOLD (rejecting)\n"); rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_HOLD_REJ); break; case GSM48_MT_CC_RETR: DEBUGP(DCC, "-> RETR (rejecting)\n"); rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC, GSM48_MT_CC_RETR_REJ); break; default: fprintf(stderr, "Unimplemented GSM 04.08 CC msg type 0x%02x\n", msg_type); break; } return rc; } /* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */ int gsm0408_rcvmsg(struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); u_int8_t pdisc = gh->proto_discr & 0x0f; int rc = 0; switch (pdisc) { case GSM48_PDISC_CC: rc = gsm0408_rcv_cc(msg); break; case GSM48_PDISC_MM: rc = gsm0408_rcv_mm(msg); break; case GSM48_PDISC_RR: rc = gsm0408_rcv_rr(msg); break; case GSM48_PDISC_SMS: rc = gsm0411_rcv_sms(msg); break; case GSM48_PDISC_MM_GPRS: case GSM48_PDISC_SM_GPRS: fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02d\n", pdisc); break; default: fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02d\n", pdisc); break; } return rc; } enum chreq_type { CHREQ_T_EMERG_CALL, CHREQ_T_CALL_REEST_TCH_F, CHREQ_T_CALL_REEST_TCH_H, CHREQ_T_CALL_REEST_TCH_H_DBL, CHREQ_T_SDCCH, CHREQ_T_TCH_F, CHREQ_T_VOICE_CALL_TCH_H, CHREQ_T_DATA_CALL_TCH_H, CHREQ_T_LOCATION_UPD, CHREQ_T_PAG_R_ANY, CHREQ_T_PAG_R_TCH_F, CHREQ_T_PAG_R_TCH_FH, }; /* Section 9.1.8 / Table 9.9 */ struct chreq { u_int8_t val; u_int8_t mask; enum chreq_type type; }; /* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */ static const struct chreq chreq_type_neci1[] = { { 0xa0, 0xe0, CHREQ_T_EMERG_CALL }, { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F }, { 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H }, { 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL }, { 0xe0, 0xe0, CHREQ_T_SDCCH }, { 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H }, { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H }, { 0x00, 0xf0, CHREQ_T_LOCATION_UPD }, { 0x10, 0xf0, CHREQ_T_SDCCH }, { 0x80, 0xe0, CHREQ_T_PAG_R_ANY }, { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F }, { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH }, }; /* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */ static const struct chreq chreq_type_neci0[] = { { 0xa0, 0xe0, CHREQ_T_EMERG_CALL }, { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H }, { 0xe0, 0xe0, CHREQ_T_TCH_F }, { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H }, { 0x00, 0xe0, CHREQ_T_LOCATION_UPD }, { 0x80, 0xe0, CHREQ_T_PAG_R_ANY }, { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F }, { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH }, }; static const enum gsm_chan_t ctype_by_chreq[] = { [CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F, [CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F, [CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H, [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H, [CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH, [CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F, [CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H, [CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H, [CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH, [CHREQ_T_PAG_R_ANY] = GSM_LCHAN_SDCCH, [CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F, [CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F, }; static const enum gsm_chreq_reason_t reason_by_chreq[] = { [CHREQ_T_EMERG_CALL] = GSM_CHREQ_REASON_EMERG, [CHREQ_T_CALL_REEST_TCH_F] = GSM_CHREQ_REASON_CALL, [CHREQ_T_CALL_REEST_TCH_H] = GSM_CHREQ_REASON_CALL, [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_CHREQ_REASON_CALL, [CHREQ_T_SDCCH] = GSM_CHREQ_REASON_OTHER, [CHREQ_T_TCH_F] = GSM_CHREQ_REASON_OTHER, [CHREQ_T_VOICE_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER, [CHREQ_T_DATA_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER, [CHREQ_T_LOCATION_UPD] = GSM_CHREQ_REASON_LOCATION_UPD, [CHREQ_T_PAG_R_ANY] = GSM_CHREQ_REASON_PAG, [CHREQ_T_PAG_R_TCH_F] = GSM_CHREQ_REASON_PAG, [CHREQ_T_PAG_R_TCH_FH] = GSM_CHREQ_REASON_PAG, }; enum gsm_chan_t get_ctype_by_chreq(struct gsm_bts *bts, u_int8_t ra) { int i; /* FIXME: determine if we set NECI = 0 in the BTS SI4 */ for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) { const struct chreq *chr = &chreq_type_neci0[i]; if ((ra & chr->mask) == chr->val) return ctype_by_chreq[chr->type]; } fprintf(stderr, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra); return GSM_LCHAN_SDCCH; } enum gsm_chreq_reason_t get_reason_by_chreq(struct gsm_bts *bts, u_int8_t ra) { int i; /* FIXME: determine if we set NECI = 0 in the BTS SI4 */ for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) { const struct chreq *chr = &chreq_type_neci0[i]; if ((ra & chr->mask) == chr->val) return reason_by_chreq[chr->type]; } fprintf(stderr, "Unknown CHANNEL REQUEST REASON 0x%02x\n", ra); return GSM_CHREQ_REASON_OTHER; }