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osmo-bsc/openbsc/src/gsm_04_08.c

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/* 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;
}
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