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Diffstat (limited to 'openbsc/src/gsm_04_08.c')
| -rw-r--r-- | openbsc/src/gsm_04_08.c | 1723 |
1 files changed, 1723 insertions, 0 deletions
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c new file mode 100644 index 000000000..274d3b6bf --- /dev/null +++ b/openbsc/src/gsm_04_08.c @@ -0,0 +1,1723 @@ +/* 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 <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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <time.h> +#include <netinet/in.h> + +#include <openbsc/db.h> +#include <openbsc/msgb.h> +#include <openbsc/tlv.h> +#include <openbsc/debug.h> +#include <openbsc/gsm_data.h> +#include <openbsc/gsm_subscriber.h> +#include <openbsc/gsm_04_11.h> +#include <openbsc/gsm_04_08.h> +#include <openbsc/abis_rsl.h> +#include <openbsc/chan_alloc.h> +#include <openbsc/paging.h> +#include <openbsc/signal.h> +#include <openbsc/trau_frame.h> +#include <openbsc/trau_mux.h> + +#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 void parse_meas_rep(struct gsm_meas_rep *rep, const u_int8_t *data, + int len) +{ + memset(rep, 0, sizeof(*rep)); + + if (data[0] & 0x80) + rep->flags |= MEAS_REP_F_BA1; + if (data[0] & 0x40) + rep->flags |= MEAS_REP_F_DTX; + if (data[1] & 0x40) + rep->flags |= MEAS_REP_F_VALID; + + rep->rxlev_full = data[0] & 0x3f; + rep->rxlev_sub = data[1] & 0x3f; + rep->rxqual_full = (data[3] >> 4) & 0x7; + rep->rxqual_sub = (data[3] >> 1) & 0x7; + rep->num_cell = data[4] >> 6 | ((data[3] & 0x01) << 2); + if (rep->num_cell < 1) + return; + + /* an encoding nightmare in perfection */ + + rep->cell[0].rxlev = data[4] & 0x3f; + rep->cell[0].bcch_freq = data[5] >> 2; + rep->cell[0].bsic = ((data[5] & 0x03) << 3) | (data[6] >> 5); + if (rep->num_cell < 2) + return; + + rep->cell[1].rxlev = ((data[6] & 0x1f) << 1) | (data[7] >> 7); + rep->cell[1].bcch_freq = (data[7] >> 2) & 0x1f; + rep->cell[1].bsic = ((data[7] & 0x03) << 4) | (data[8] >> 4); + if (rep->num_cell < 3) + return; + + rep->cell[2].rxlev = ((data[8] & 0x0f) << 2) | (data[9] >> 6); + rep->cell[2].bcch_freq = (data[9] >> 1) & 0x1f; + rep->cell[2].bsic = ((data[9] & 0x01) << 6) | (data[10] >> 3); + if (rep->num_cell < 4) + return; + + rep->cell[3].rxlev = ((data[10] & 0x07) << 3) | (data[11] >> 5); + rep->cell[3].bcch_freq = data[11] & 0x1f; + rep->cell[3].bsic = data[12] >> 2; + if (rep->num_cell < 5) + return; + + rep->cell[4].rxlev = ((data[12] & 0x03) << 4) | (data[13] >> 4); + rep->cell[4].bcch_freq = ((data[13] & 0xf) << 1) | (data[14] >> 7); + rep->cell[4].bsic = (data[14] >> 1) & 0x3f; + if (rep->num_cell < 6) + return; + + rep->cell[5].rxlev = ((data[14] & 0x01) << 5) | (data[15] >> 3); + rep->cell[5].bcch_freq = ((data[15] & 0x07) << 2) | (data[16] >> 6); + rep->cell[5].bsic = data[16] & 0x3f; +} + +int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int32_t tmsi); +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 int gsm0408_authorize(struct gsm_lchan *lchan, struct msgb *msg) +{ + u_int32_t tmsi; + + if (authorize_subscriber(lchan->loc_operation, lchan->subscr)) { + db_subscriber_alloc_tmsi(lchan->subscr); + subscr_update(lchan->subscr, msg->trx->bts, GSM_SUBSCRIBER_UPDATE_ATTACHED); + tmsi = strtoul(lchan->subscr->tmsi, NULL, 10); + release_loc_updating_req(lchan); + return gsm0408_loc_upd_acc(msg->lchan, tmsi); + } + + return 0; +} + +static int gsm0408_handle_lchan_signal(unsigned int subsys, unsigned int signal, + void *handler_data, void *signal_data) +{ + if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE) + return 0; + + /* + * Cancel any outstanding location updating request + * operation taking place on the lchan. + */ + struct gsm_lchan *lchan = (struct gsm_lchan *)handler_data; + release_loc_updating_req(lchan); + + return 0; +} + +/* + * This will be ran by the linker when loading the DSO. We use it to + * do system initialization, e.g. registration of signal handlers. + */ +static __attribute__((constructor)) void on_dso_load_0408(void) +{ + register_signal_handler(SS_LCHAN, gsm0408_handle_lchan_signal, NULL); +} + +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]; + + 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 */ + return gsm0408_authorize(lchan, msg); +} + + +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 gsm48_loc_upd_req *lu; + struct gsm_subscriber *subscr; + struct gsm_lchan *lchan = msg->lchan; + u_int8_t mi_type; + 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)); + + /* + * Pseudo Spoof detection: Just drop a second/concurrent + * location updating request. + */ + if (lchan->loc_operation) { + DEBUGP(DMM, "LUPDREQ: ignoring request due an existing one: %p.\n", + lchan->loc_operation); + gsm0408_loc_upd_rej(lchan, GSM48_REJECT_PROTOCOL_ERROR); + return 0; + } + + 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); + return gsm0408_authorize(lchan, msg); +} + +/* 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); + DEBUGPC(DMM, "serv_type=0x%02x mi_type=0x%02x M(%s)\n", + req->cm_service_type, mi_type, mi_string); + + subscr = subscr_get_by_tmsi(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); + } + + subscr->classmark2_len = classmark2_len; + memcpy(subscr->classmark2, classmark2, classmark2_len); + + 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; +} + +static int gsm48_rx_mm_status(struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + + DEBUGP(DMM, "MM STATUS (reject cause 0x%02x)\n", gh->data[0]); + + 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: + rc = gsm48_rx_mm_status(msg); + 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); + + subscr->classmark2_len = *classmark2_lv; + memcpy(subscr->classmark2, classmark2_lv+1, *classmark2_lv); + + 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_classmark(struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm_subscriber *subscr = msg->lchan->subscr; + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + u_int8_t cm2_len, cm3_len = 0; + u_int8_t *cm2, *cm3 = NULL; + + DEBUGP(DRR, "CLASSMARK CHANGE "); + + /* classmark 2 */ + cm2_len = gh->data[0]; + cm2 = &gh->data[1]; + DEBUGPC(DRR, "CM2(len=%u) ", cm2_len); + + if (payload_len > cm2_len + 1) { + /* we must have a classmark3 */ + if (gh->data[cm2_len+1] != 0x20) { + DEBUGPC(DRR, "ERR CM3 TAG\n"); + return -EINVAL; + } + if (cm2_len > 3) { + DEBUGPC(DRR, "CM2 too long!\n"); + return -EINVAL; + } + + cm3_len = gh->data[cm2_len+2]; + cm3 = &gh->data[cm2_len+3]; + if (cm3_len > 14) { + DEBUGPC(DRR, "CM3 len %u too long!\n", cm3_len); + return -EINVAL; + } + DEBUGPC(DRR, "CM3(len=%u)\n", cm3_len); + } + if (subscr) { + subscr->classmark2_len = cm2_len; + memcpy(subscr->classmark2, cm2, cm2_len); + if (cm3) { + subscr->classmark3_len = cm3_len; + memcpy(subscr->classmark3, cm3, cm3_len); + } + } + + /* FIXME: store the classmark2/3 values with the equipment register */ + + return 0; +} + +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; +} + +static int gsm48_rx_rr_meas_rep(struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + static struct gsm_meas_rep meas_rep; + + DEBUGP(DRR, "MEASUREMENT REPORT "); + parse_meas_rep(&meas_rep, gh->data, payload_len); + if (meas_rep.flags & MEAS_REP_F_DTX) + DEBUGPC(DRR, "DTX "); + if (meas_rep.flags & MEAS_REP_F_BA1) + DEBUGPC(DRR, "BA1 "); + if (!(meas_rep.flags & MEAS_REP_F_VALID)) + DEBUGPC(DRR, "NOT VALID "); + else + DEBUGPC(DRR, "FULL(lev=%u, qual=%u) SUB(lev=%u, qual=%u) ", + meas_rep.rxlev_full, meas_rep.rxqual_full, meas_rep.rxlev_sub, + meas_rep.rxqual_sub); + + DEBUGPC(DRR, "NUM_NEIGH=%u\n", meas_rep.num_cell); + + /* FIXME: put the results somwhere */ + + 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: + rc = gsm48_rx_rr_classmark(msg); + 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; + case GSM48_MT_RR_MEAS_REP: + rc = gsm48_rx_rr_meas_rep(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; +} |