| /* 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_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 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; |
| |
| 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; |
| 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 ", 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); |
| |
| 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; |
| |
| if (msg->data_len < sizeof(struct gsm48_service_request*)) { |
| DEBUGP(DMM, "<- CM SERVICE REQUEST wrong sized message\n"); |
| return gsm48_tx_mm_serv_rej(msg->lchan, |
| GSM48_REJECT_INCORRECT_MESSAGE); |
| } |
| |
| if (msg->data_len < req->mi_len + 6) { |
| DEBUGP(DMM, "<- CM SERVICE REQUEST MI does not fit in package\n"); |
| return gsm48_tx_mm_serv_rej(msg->lchan, |
| GSM48_REJECT_INCORRECT_MESSAGE); |
| } |
| |
| mi_type = req->mi[0] & GSM_MI_TYPE_MASK; |
| if (mi_type != GSM_MI_TYPE_TMSI) { |
| DEBUGP(DMM, "<- CM SERVICE REQUEST 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), req->mi, req->mi_len); |
| subscr = subscr_get_by_tmsi(mi_string); |
| DEBUGP(DMM, "<- CM SERVICE REQUEST 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 ? */ |
| fprintf(stderr, "Unimplemented mobile identity type\n"); |
| break; |
| default: |
| fprintf(stderr, "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); |
| } 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); |
| } |
| |
| 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; |
| } |
| |
| /* 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; |
| 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); |
| 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 */ |
| 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; |
| } |