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osmo-msc/src/libmsc/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) 2008-2016 by Harald Welte <laforge@gnumonks.org>
* (C) 2008-2012 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 Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <time.h>
#include <netinet/in.h>
#include <regex.h>
#include <sys/types.h>
#include "bscconfig.h"
#include <osmocom/msc/db.h>
#include <osmocom/msc/debug.h>
#include <osmocom/msc/gsm_data.h>
#include <osmocom/msc/gsm_subscriber.h>
#include <osmocom/msc/gsm_04_11.h>
#include <osmocom/msc/gsm_04_08.h>
#include <osmocom/msc/gsm_04_80.h>
#include <osmocom/msc/gsm_04_14.h>
#include <osmocom/msc/signal.h>
#include <osmocom/msc/transaction.h>
#include <osmocom/msc/ussd.h>
#include <osmocom/msc/silent_call.h>
#include <osmocom/msc/osmo_msc.h>
#include <osmocom/msc/mncc_int.h>
#include <osmocom/abis/e1_input.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/msc/vlr.h>
#include <osmocom/msc/msc_ifaces.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/gsm/gsm0480.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/byteswap.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/crypt/auth.h>
#ifdef BUILD_IU
#include <osmocom/ranap/iu_client.h>
#endif
#include <osmocom/msc/msc_ifaces.h>
#include <osmocom/msc/a_iface.h>
#include <osmocom/msc/msc_mgcp.h>
#include <assert.h>
void *tall_locop_ctx;
void *tall_authciphop_ctx;
static int gsm0408_loc_upd_acc(struct gsm_subscriber_connection *conn,
uint32_t send_tmsi);
static int gsm48_tx_simple(struct gsm_subscriber_connection *conn,
uint8_t pdisc, uint8_t msg_type);
static uint32_t new_callref = 0x80000001;
static bool classmark_is_r99(struct gsm_classmark *cm)
{
int rev_lev = 0;
if (cm->classmark1_set)
rev_lev = cm->classmark1.rev_lev;
else if (cm->classmark2_len > 0)
rev_lev = (cm->classmark2[0] >> 5) & 0x3;
return rev_lev >= 2;
}
/* Determine if the given CLASSMARK (1/2/3) value permits a given A5/n cipher */
static bool classmark_supports_a5(const struct gsm_classmark *cm, uint8_t a5)
{
switch (a5) {
case 0:
/* all phones must implement A5/0, see 3GPP TS 43.020 4.9 */
return true;
case 1:
/* 3GPP TS 43.020 4.9 requires A5/1 to be suppored by all phones and actually states:
* "The network shall not provide service to an MS which indicates that it does not
* support the ciphering algorithm A5/1.". However, let's be more tolerant based
* on policy here */
/* See 3GPP TS 24.008 10.5.1.7 */
if (!cm->classmark1_set) {
DEBUGP(DMSC, "CLASSMARK 1 unknown, assuming MS supports A5/1\n");
return true;
} else {
if (cm->classmark1.a5_1)
return false; /* Inverted logic for this bit! */
else
return true;
}
break;
case 2:
case 3:
/* See 3GPP TS 24.008 10.5.1.6 */
if (cm->classmark2_len < 3) {
DEBUGP(DMSC, "CLASSMARK 2 unknown, assuming MS doesn't support A5/%u\n", a5);
return false;
} else {
if (cm->classmark2[2] & (1 << (a5-2)))
return true;
else
return false;
}
break;
case 4:
case 5:
case 6:
case 7:
/* See 3GPP TS 24.008 10.5.1.7 */
if (cm->classmark3_len < 1) {
DEBUGP(DMSC, "CLASSMARK 3 unknown, assuming MS doesn't support A5/%u\n", a5);
return false;
} else {
if (cm->classmark3[0] & (1 << (a5-4)))
return true;
else
return false;
}
break;
default:
return false;
}
}
void cc_tx_to_mncc(struct gsm_network *net, struct msgb *msg)
{
net->mncc_recv(net, msg);
}
static int gsm48_conn_sendmsg(struct msgb *msg, struct gsm_subscriber_connection *conn,
struct gsm_trans *trans)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data;
/* if we get passed a transaction reference, do some common
* work that the caller no longer has to do */
if (trans) {
gh->proto_discr = trans->protocol | (trans->transaction_id << 4);
OMSC_LINKID_CB(msg) = trans->dlci;
}
return msc_tx_dtap(conn, msg);
}
int gsm48_cc_tx_notify_ss(struct gsm_trans *trans, const char *message)
{
struct gsm48_hdr *gh;
struct msgb *ss_notify;
ss_notify = gsm0480_create_notifySS(message);
if (!ss_notify)
return -1;
gsm0480_wrap_invoke(ss_notify, GSM0480_OP_CODE_NOTIFY_SS, 0);
uint8_t *data = msgb_push(ss_notify, 1);
data[0] = ss_notify->len - 1;
gh = (struct gsm48_hdr *) msgb_push(ss_notify, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_FACILITY;
return gsm48_conn_sendmsg(ss_notify, trans->conn, trans);
}
/* clear all transactions globally; used in case of MNCC socket disconnect */
void gsm0408_clear_all_trans(struct gsm_network *net, int protocol)
{
struct gsm_trans *trans, *temp;
LOGP(DCC, LOGL_NOTICE, "Clearing all currently active transactions!!!\n");
llist_for_each_entry_safe(trans, temp, &net->trans_list, entry) {
if (trans->protocol == protocol) {
trans->callref = 0;
trans_free(trans);
}
}
}
/* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */
static int gsm0408_loc_upd_rej(struct gsm_subscriber_connection *conn, uint8_t cause)
{
struct msgb *msg;
msg = gsm48_create_loc_upd_rej(cause);
if (!msg) {
LOGP(DMM, LOGL_ERROR, "Failed to create msg for LOCATION UPDATING REJECT.\n");
return -1;
}
LOGP(DMM, LOGL_INFO, "Subscriber %s: LOCATION UPDATING REJECT\n",
vlr_subscr_name(conn->vsub));
return gsm48_conn_sendmsg(msg, conn, NULL);
}
/* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */
static int gsm0408_loc_upd_acc(struct gsm_subscriber_connection *conn,
uint32_t send_tmsi)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD ACC");
struct gsm48_hdr *gh;
struct gsm48_loc_area_id *lai;
uint8_t *mid;
struct osmo_location_area_id laid = {
.plmn = conn->network->plmn,
.lac = conn->lac,
};
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));
gsm48_generate_lai2(lai, &laid);
if (send_tmsi == GSM_RESERVED_TMSI) {
/* we did not allocate a TMSI to the MS, so we need to
* include the IMSI in order for the MS to delete any
* old TMSI that might still be allocated */
uint8_t mi[10];
int len;
len = gsm48_generate_mid_from_imsi(mi, conn->vsub->imsi);
mid = msgb_put(msg, len);
memcpy(mid, mi, len);
DEBUGP(DMM, "-> %s LOCATION UPDATE ACCEPT\n",
vlr_subscr_name(conn->vsub));
} else {
/* Include the TMSI, which means that the MS will send a
* TMSI REALLOCATION COMPLETE, and we should wait for
* that until T3250 expiration */
mid = msgb_put(msg, GSM48_MID_TMSI_LEN);
gsm48_generate_mid_from_tmsi(mid, send_tmsi);
DEBUGP(DMM, "-> %s LOCATION UPDATE ACCEPT (TMSI = 0x%08x)\n",
vlr_subscr_name(conn->vsub),
send_tmsi);
}
/* TODO: Follow-on proceed */
/* TODO: CTS permission */
/* TODO: Equivalent PLMNs */
/* TODO: Emergency Number List */
/* TODO: Per-MS T3312 */
return gsm48_conn_sendmsg(msg, conn, NULL);
}
/* Transmit Chapter 9.2.10 Identity Request */
static int mm_tx_identity_req(struct gsm_subscriber_connection *conn, uint8_t id_type)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ");
struct gsm48_hdr *gh;
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_conn_sendmsg(msg, conn, NULL);
}
/* Parse Chapter 9.2.11 Identity Response */
static int mm_rx_id_resp(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK;
char mi_string[GSM48_MI_SIZE];
if (!conn->vsub) {
LOGP(DMM, LOGL_ERROR,
"Rx MM Identity Response: invalid: no subscriber\n");
return -EINVAL;
}
gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]);
DEBUGP(DMM, "IDENTITY RESPONSE: MI(%s)=%s\n",
gsm48_mi_type_name(mi_type), mi_string);
osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, gh->data);
return vlr_subscr_rx_id_resp(conn->vsub, gh->data+1, gh->data[0]);
}
/* FIXME: to libosmogsm */
static const struct value_string lupd_names[] = {
{ GSM48_LUPD_NORMAL, "NORMAL" },
{ GSM48_LUPD_PERIODIC, "PERIODIC" },
{ GSM48_LUPD_IMSI_ATT, "IMSI ATTACH" },
{ 0, NULL }
};
/* Chapter 9.2.15: Receive Location Updating Request.
* Keep this function non-static for direct invocation by unit tests. */
int mm_rx_loc_upd_req(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm_network *net = conn->network;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_loc_upd_req *lu;
uint8_t mi_type;
char mi_string[GSM48_MI_SIZE];
enum vlr_lu_type vlr_lu_type = VLR_LU_TYPE_REGULAR;
uint32_t tmsi;
char *imsi;
struct osmo_location_area_id old_lai, new_lai;
struct osmo_fsm_inst *lu_fsm;
bool is_utran;
lu = (struct gsm48_loc_upd_req *) gh->data;
mi_type = lu->mi[0] & GSM_MI_TYPE_MASK;
gsm48_mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len);
if (msc_subscr_conn_is_establishing_auth_ciph(conn)) {
LOGP(DMM, LOGL_ERROR,
"Cannot accept another LU, conn already busy establishing authenticity;"
" extraneous LOCATION UPDATING REQUEST: MI(%s)=%s type=%s\n",
gsm48_mi_type_name(mi_type), mi_string, get_value_string(lupd_names, lu->type));
return -EINVAL;
}
if (msc_subscr_conn_is_accepted(conn)) {
LOGP(DMM, LOGL_ERROR,
"Cannot accept another LU, conn already established;"
" extraneous LOCATION UPDATING REQUEST: MI(%s)=%s type=%s\n",
gsm48_mi_type_name(mi_type), mi_string, get_value_string(lupd_names, lu->type));
return -EINVAL;
}
msc_subscr_conn_update_id(conn, COMPLETE_LAYER3_LU, mi_string);
conn->classmark.classmark1 = lu->classmark1;
conn->classmark.classmark1_set = true;
DEBUGP(DMM, "LOCATION UPDATING REQUEST: MI(%s)=%s type=%s\n",
gsm48_mi_type_name(mi_type), mi_string,
get_value_string(lupd_names, lu->type));
osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, &lu->mi_len);
switch (lu->type) {
case GSM48_LUPD_NORMAL:
rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_NORMAL]);
vlr_lu_type = VLR_LU_TYPE_REGULAR;
break;
case GSM48_LUPD_IMSI_ATT:
rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_ATTACH]);
vlr_lu_type = VLR_LU_TYPE_IMSI_ATTACH;
break;
case GSM48_LUPD_PERIODIC:
rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_PERIODIC]);
vlr_lu_type = VLR_LU_TYPE_PERIODIC;
break;
}
/* TODO: 10.5.1.6 MS Classmark for UMTS / Classmark 2 */
/* TODO: 10.5.3.14 Aditional update parameters (CS fallback calls) */
/* TODO: 10.5.7.8 Device properties */
/* TODO: 10.5.1.15 MS network feature support */
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
tmsi = GSM_RESERVED_TMSI;
imsi = mi_string;
break;
case GSM_MI_TYPE_TMSI:
tmsi = tmsi_from_string(mi_string);
imsi = NULL;
break;
default:
DEBUGPC(DMM, "unknown mobile identity type\n");
tmsi = GSM_RESERVED_TMSI;
imsi = NULL;
break;
}
gsm48_decode_lai2(&lu->lai, &old_lai);
new_lai.plmn = conn->network->plmn;
new_lai.lac = conn->lac;
DEBUGP(DMM, "LU/new-LAC: %u/%u\n", old_lai.lac, new_lai.lac);
is_utran = (conn->via_ran == RAN_UTRAN_IU);
lu_fsm = vlr_loc_update(conn->fi,
SUBSCR_CONN_E_ACCEPTED, SUBSCR_CONN_E_CN_CLOSE, NULL,
net->vlr, conn, vlr_lu_type, tmsi, imsi,
&old_lai, &new_lai,
is_utran || conn->network->authentication_required,
is_utran || conn->network->a5_encryption_mask > 0x01,
classmark_is_r99(&conn->classmark),
is_utran,
net->vlr->cfg.assign_tmsi);
if (!lu_fsm) {
DEBUGP(DRR, "%s: Can't start LU FSM\n", mi_string);
return 0;
}
/* From vlr_loc_update() we expect an implicit dispatch of
* VLR_ULA_E_UPDATE_LA, and thus we expect msc_vlr_subscr_assoc() to
* already have been called and completed. Has an error occured? */
if (!conn->vsub || conn->vsub->lu_fsm != lu_fsm) {
LOGP(DRR, LOGL_ERROR,
"%s: internal error during Location Updating attempt\n",
mi_string);
return -EIO;
}
msc_subscr_conn_complete_layer_3(conn);
return 0;
}
/* Turn int into semi-octet representation: 98 => 0x89 */
/* FIXME: libosmocore/libosmogsm */
static uint8_t bcdify(uint8_t value)
{
uint8_t ret;
ret = value / 10;
ret |= (value % 10) << 4;
return ret;
}
/* Section 9.2.15a */
int gsm48_tx_mm_info(struct gsm_subscriber_connection *conn)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 MM INF");
struct gsm48_hdr *gh;
struct gsm_network *net = conn->network;
uint8_t *ptr8;
int name_len, name_pad;
time_t cur_t;
struct tm* gmt_time;
struct tm* local_time;
int tzunits;
int dst = 0;
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) {
#if 0
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 = (uint16_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 */
#endif
name_len = (strlen(net->name_long)*7)/8;
name_pad = (8 - strlen(net->name_long)*7)%8;
if (name_pad > 0)
name_len++;
/* 10.5.3.5a */
ptr8 = msgb_put(msg, 3);
ptr8[0] = GSM48_IE_NAME_LONG;
ptr8[1] = name_len +1;
ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */
ptr8 = msgb_put(msg, name_len);
gsm_7bit_encode_n(ptr8, name_len, net->name_long, NULL);
}
if (net->name_short) {
#if 0
name_len = strlen(net->name_short);
/* 10.5.3.5a */
ptr8 = (uint8_t *) msgb_put(msg, 3);
ptr8[0] = GSM48_IE_NAME_SHORT;
ptr8[1] = name_len*2 + 1;
ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
ptr16 = (uint16_t *) msgb_put(msg, name_len*2);
for (i = 0; i < name_len; i++)
ptr16[i] = htons(net->name_short[i]);
#endif
name_len = (strlen(net->name_short)*7)/8;
name_pad = (8 - strlen(net->name_short)*7)%8;
if (name_pad > 0)
name_len++;
/* 10.5.3.5a */
ptr8 = (uint8_t *) msgb_put(msg, 3);
ptr8[0] = GSM48_IE_NAME_SHORT;
ptr8[1] = name_len +1;
ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */
ptr8 = msgb_put(msg, name_len);
gsm_7bit_encode_n(ptr8, name_len, net->name_short, NULL);
}
/* Section 10.5.3.9 */
cur_t = time(NULL);
gmt_time = gmtime(&cur_t);
ptr8 = msgb_put(msg, 8);
ptr8[0] = GSM48_IE_NET_TIME_TZ;
ptr8[1] = bcdify(gmt_time->tm_year % 100);
ptr8[2] = bcdify(gmt_time->tm_mon + 1);
ptr8[3] = bcdify(gmt_time->tm_mday);
ptr8[4] = bcdify(gmt_time->tm_hour);
ptr8[5] = bcdify(gmt_time->tm_min);
ptr8[6] = bcdify(gmt_time->tm_sec);
if (net->tz.override) {
/* Convert tz.hr and tz.mn to units */
if (net->tz.hr < 0) {
tzunits = ((net->tz.hr/-1)*4);
tzunits = tzunits + (net->tz.mn/15);
ptr8[7] = bcdify(tzunits);
/* Set negative time */
ptr8[7] |= 0x08;
}
else {
tzunits = net->tz.hr*4;
tzunits = tzunits + (net->tz.mn/15);
ptr8[7] = bcdify(tzunits);
}
/* Convert DST value */
if (net->tz.dst >= 0 && net->tz.dst <= 2)
dst = net->tz.dst;
}
else {
/* Need to get GSM offset and convert into 15 min units */
/* This probably breaks if gmtoff returns a value not evenly divisible by 15? */
#ifdef HAVE_TM_GMTOFF_IN_TM
local_time = localtime(&cur_t);
tzunits = (local_time->tm_gmtoff/60)/15;
#else
/* find timezone offset */
time_t utc;
double offsetFromUTC;
utc = mktime(gmt_time);
local_time = localtime(&cur_t);
offsetFromUTC = difftime(cur_t, utc);
if (local_time->tm_isdst)
offsetFromUTC += 3600.0;
tzunits = ((int)offsetFromUTC) / 60 / 15;
#endif
if (tzunits < 0) {
tzunits = tzunits/-1;
ptr8[7] = bcdify(tzunits);
/* Flip it to negative */
ptr8[7] |= 0x08;
}
else
ptr8[7] = bcdify(tzunits);
/* Does not support DST +2 */
if (local_time->tm_isdst)
dst = 1;
}
if (dst) {
ptr8 = msgb_put(msg, 3);
ptr8[0] = GSM48_IE_NET_DST;
ptr8[1] = 1;
ptr8[2] = dst;
}
DEBUGP(DMM, "-> MM INFO\n");
return gsm48_conn_sendmsg(msg, conn, NULL);
}
/*! Send an Authentication Request to MS on the given subscriber connection
* according to 3GPP/ETSI TS 24.008, Section 9.2.2.
* \param[in] conn Subscriber connection to send on.
* \param[in] rand Random challenge token to send, must be 16 bytes long.
* \param[in] autn r99: In case of UMTS mutual authentication, AUTN token to
* send; must be 16 bytes long, or pass NULL for plain GSM auth.
* \param[in] key_seq auth tuple's sequence number.
*/
int gsm48_tx_mm_auth_req(struct gsm_subscriber_connection *conn, uint8_t *rand,
uint8_t *autn, int key_seq)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH REQ");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
struct gsm48_auth_req *ar = (struct gsm48_auth_req *) msgb_put(msg, sizeof(*ar));
DEBUGP(DMM, "-> AUTH REQ (rand = %s)\n", osmo_hexdump_nospc(rand, 16));
if (autn)
DEBUGP(DMM, " AUTH REQ (autn = %s)\n", osmo_hexdump_nospc(autn, 16));
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_AUTH_REQ;
ar->key_seq = key_seq;
/* 16 bytes RAND parameters */
osmo_static_assert(sizeof(ar->rand) == 16, sizeof_auth_req_r99_rand);
if (rand)
memcpy(ar->rand, rand, 16);
/* 16 bytes AUTN */
if (autn)
msgb_tlv_put(msg, GSM48_IE_AUTN, 16, autn);
return gsm48_conn_sendmsg(msg, conn, NULL);
}
/* Section 9.2.1 */
int gsm48_tx_mm_auth_rej(struct gsm_subscriber_connection *conn)
{
DEBUGP(DMM, "-> AUTH REJECT\n");
return gsm48_tx_simple(conn, GSM48_PDISC_MM, GSM48_MT_MM_AUTH_REJ);
}
static int msc_vlr_tx_cm_serv_acc(void *msc_conn_ref);
static int msc_vlr_tx_cm_serv_rej(void *msc_conn_ref, enum gsm48_reject_value result);
static int cm_serv_reuse_conn(struct gsm_subscriber_connection *conn, const uint8_t *mi_lv)
{
uint8_t mi_type;
char mi_string[GSM48_MI_SIZE];
uint32_t tmsi;
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi_lv+1, mi_lv[0]);
mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
if (vlr_subscr_matches_imsi(conn->vsub, mi_string))
goto accept_reuse;
break;
case GSM_MI_TYPE_TMSI:
tmsi = osmo_load32be(mi_lv+2);
if (vlr_subscr_matches_tmsi(conn->vsub, tmsi))
goto accept_reuse;
break;
case GSM_MI_TYPE_IMEI:
if (vlr_subscr_matches_imei(conn->vsub, mi_string))
goto accept_reuse;
break;
default:
break;
}
LOGP(DMM, LOGL_ERROR, "%s: CM Service Request with mismatching mobile identity: %s %s\n",
vlr_subscr_name(conn->vsub), gsm48_mi_type_name(mi_type), mi_string);
msc_vlr_tx_cm_serv_rej(conn, GSM48_REJECT_ILLEGAL_MS);
return -EINVAL;
accept_reuse:
DEBUGP(DMM, "%s: re-using already accepted connection\n",
vlr_subscr_name(conn->vsub));
if (!conn->received_cm_service_request) {
conn->received_cm_service_request = true;
msc_subscr_conn_get(conn, MSC_CONN_USE_CM_SERVICE);
}
msc_subscr_conn_update_id(conn, conn->complete_layer3_type, mi_string);
return conn->network->vlr->ops.tx_cm_serv_acc(conn);
}
/*
* 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 conn and accept
*
* Keep this function non-static for direct invocation by unit tests.
*/
int gsm48_rx_mm_serv_req(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm_network *net = conn->network;
uint8_t mi_type;
char mi_string[GSM48_MI_SIZE];
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_service_request *req =
(struct gsm48_service_request *)gh->data;
/* unfortunately in Phase1 the classmark2 length is variable */
uint8_t classmark2_len = gh->data[1];
uint8_t *classmark2 = gh->data+2;
uint8_t *mi_p = classmark2 + classmark2_len;
uint8_t mi_len = *mi_p;
uint8_t *mi = mi_p + 1;
struct osmo_location_area_id lai;
bool is_utran;
lai.plmn = conn->network->plmn;
lai.lac = conn->lac;
if (msg->data_len < sizeof(struct gsm48_service_request*)) {
LOGP(DMM, LOGL_ERROR, "<- CM SERVICE REQUEST wrong sized message\n");
return msc_gsm48_tx_mm_serv_rej(conn,
GSM48_REJECT_INCORRECT_MESSAGE);
}
if (msg->data_len < req->mi_len + 6) {
LOGP(DMM, LOGL_ERROR, "<- CM SERVICE REQUEST does not fit in packet\n");
return msc_gsm48_tx_mm_serv_rej(conn,
GSM48_REJECT_INCORRECT_MESSAGE);
}
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
mi_type = mi[0] & GSM_MI_TYPE_MASK;
DEBUGP(DMM, "<- CM SERVICE REQUEST serv_type=0x%02x MI(%s)=%s\n",
req->cm_service_type, gsm48_mi_type_name(mi_type), mi_string);
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
case GSM_MI_TYPE_TMSI:
/* continue below */
break;
case GSM_MI_TYPE_IMEI:
if (req->cm_service_type == GSM48_CMSERV_EMERGENCY) {
/* We don't do emergency calls by IMEI */
LOGP(DMM, LOGL_NOTICE, "<- CM SERVICE REQUEST(IMEI=%s) rejected\n", mi_string);
return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_IMEI_NOT_ACCEPTED);
}
/* fall-through for non-emergency setup */
default:
DEBUGPC(DMM, "mi_type is not expected: %d\n", mi_type);
return msc_gsm48_tx_mm_serv_rej(conn,
GSM48_REJECT_INCORRECT_MESSAGE);
}
switch (req->cm_service_type) {
case GSM48_CMSERV_MO_CALL_PACKET:
case GSM48_CMSERV_EMERGENCY:
case GSM48_CMSERV_SMS:
case GSM48_CMSERV_SUP_SERV:
/* continue below */
break;
default:
return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED);
}
if (msc_subscr_conn_is_accepted(conn))
return cm_serv_reuse_conn(conn, mi_p);
if (msc_subscr_conn_is_establishing_auth_ciph(conn)) {
LOGP(DMM, LOGL_ERROR,
"Cannot accept CM Service Request, conn already busy establishing authenticity\n");
msc_vlr_tx_cm_serv_rej(conn, GSM48_REJECT_CONGESTION);
return -EINVAL;
/* or should we accept and note down the service request anyway? */
}
msc_subscr_conn_update_id(conn, COMPLETE_LAYER3_CM_SERVICE_REQ, mi_string);
osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, mi_p);
memcpy(conn->classmark.classmark2, classmark2, classmark2_len);
conn->classmark.classmark2_len = classmark2_len;
is_utran = (conn->via_ran == RAN_UTRAN_IU);
vlr_proc_acc_req(conn->fi,
SUBSCR_CONN_E_ACCEPTED, SUBSCR_CONN_E_CN_CLOSE, NULL,
net->vlr, conn,
VLR_PR_ARQ_T_CM_SERV_REQ, mi-1, &lai,
is_utran || conn->network->authentication_required,
is_utran || conn->network->a5_encryption_mask > 0x01,
classmark_is_r99(&conn->classmark),
is_utran);
msc_subscr_conn_complete_layer_3(conn);
return 0;
}
/* Receive a CM Re-establish Request */
static int gsm48_rx_cm_reest_req(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
uint8_t mi_type;
char mi_string[GSM48_MI_SIZE];
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t classmark2_len = gh->data[1];
uint8_t *classmark2 = gh->data+2;
uint8_t mi_len = *(classmark2 + classmark2_len);
uint8_t *mi = (classmark2 + classmark2_len + 1);
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
mi_type = mi[0] & GSM_MI_TYPE_MASK;
DEBUGP(DMM, "<- CM RE-ESTABLISH REQUEST MI(%s)=%s\n", gsm48_mi_type_name(mi_type), mi_string);
/* we don't support CM call re-establishment */
return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED);
}
static int gsm48_rx_mm_imsi_detach_ind(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm_network *network = conn->network;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_imsi_detach_ind *idi =
(struct gsm48_imsi_detach_ind *) gh->data;
uint8_t mi_type = idi->mi[0] & GSM_MI_TYPE_MASK;
char mi_string[GSM48_MI_SIZE];
struct vlr_subscr *vsub = NULL;
gsm48_mi_to_string(mi_string, sizeof(mi_string), idi->mi, idi->mi_len);
DEBUGP(DMM, "IMSI DETACH INDICATION: MI(%s)=%s\n",
gsm48_mi_type_name(mi_type), mi_string);
rate_ctr_inc(&network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_DETACH]);
switch (mi_type) {
case GSM_MI_TYPE_TMSI:
vsub = vlr_subscr_find_by_tmsi(network->vlr,
tmsi_from_string(mi_string));
break;
case GSM_MI_TYPE_IMSI:
vsub = vlr_subscr_find_by_imsi(network->vlr, mi_string);
break;
case GSM_MI_TYPE_IMEI:
case GSM_MI_TYPE_IMEISV:
/* no sim card... FIXME: what to do ? */
LOGP(DMM, LOGL_ERROR, "MI(%s)=%s: unimplemented mobile identity type\n",
gsm48_mi_type_name(mi_type), mi_string);
break;
default:
LOGP(DMM, LOGL_ERROR, "MI(%s)=%s: unknown mobile identity type\n",
gsm48_mi_type_name(mi_type), mi_string);
break;
}
/* TODO? We used to remember the subscriber's classmark1 here and
* stored it in the old sqlite db, but now we store it in a conn that
* will be discarded anyway: */
conn->classmark.classmark1 = idi->classmark1;
if (!vsub) {
LOGP(DMM, LOGL_ERROR, "IMSI DETACH for unknown subscriber MI(%s)=%s\n",
gsm48_mi_type_name(mi_type), mi_string);
} else {
LOGP(DMM, LOGL_INFO, "IMSI DETACH for %s\n", vlr_subscr_name(vsub));
if (vsub->cs.is_paging)
subscr_paging_cancel(vsub, GSM_PAGING_EXPIRED);
vlr_subscr_rx_imsi_detach(vsub);
osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_DETACHED, vsub);
vlr_subscr_put(vsub);
}
msc_subscr_conn_close(conn, 0);
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;
}
static int parse_gsm_auth_resp(uint8_t *res, uint8_t *res_len,
struct gsm_subscriber_connection *conn,
struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_auth_resp *ar = (struct gsm48_auth_resp*) gh->data;
if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*ar)) {
LOGP(DMM, LOGL_ERROR,
"%s: MM AUTHENTICATION RESPONSE:"
" l3 length invalid: %u\n",
vlr_subscr_name(conn->vsub), msgb_l3len(msg));
return -EINVAL;
}
*res_len = sizeof(ar->sres);
memcpy(res, ar->sres, sizeof(ar->sres));
return 0;
}
static int parse_umts_auth_resp(uint8_t *res, uint8_t *res_len,
struct gsm_subscriber_connection *conn,
struct msgb *msg)
{
struct gsm48_hdr *gh;
uint8_t *data;
uint8_t iei;
uint8_t ie_len;
unsigned int data_len;
/* First parse the GSM part */
if (parse_gsm_auth_resp(res, res_len, conn, msg))
return -EINVAL;
OSMO_ASSERT(*res_len == 4);
/* Then add the extended res part */
gh = msgb_l3(msg);
data = gh->data + sizeof(struct gsm48_auth_resp);
data_len = msgb_l3len(msg) - (data - (uint8_t*)msgb_l3(msg));
if (data_len < 3) {
LOGP(DMM, LOGL_ERROR,
"%s: MM AUTHENTICATION RESPONSE:"
" l3 length invalid: %u\n",
vlr_subscr_name(conn->vsub), msgb_l3len(msg));
return -EINVAL;
}
iei = data[0];
ie_len = data[1];
if (iei != GSM48_IE_AUTH_RES_EXT) {
LOGP(DMM, LOGL_ERROR,
"%s: MM R99 AUTHENTICATION RESPONSE:"
" expected IEI 0x%02x, got 0x%02x\n",
vlr_subscr_name(conn->vsub),
GSM48_IE_AUTH_RES_EXT, iei);
return -EINVAL;
}
if (ie_len > 12) {
LOGP(DMM, LOGL_ERROR,
"%s: MM R99 AUTHENTICATION RESPONSE:"
" extended Auth Resp IE 0x%02x is too large: %u bytes\n",
vlr_subscr_name(conn->vsub), GSM48_IE_AUTH_RES_EXT, ie_len);
return -EINVAL;
}
*res_len += ie_len;
memcpy(res + 4, &data[2], ie_len);
return 0;
}
/* Chapter 9.2.3: Authentication Response */
static int gsm48_rx_mm_auth_resp(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
uint8_t res[16];
uint8_t res_len;
int rc;
bool is_umts;
if (!conn->vsub) {
LOGP(DMM, LOGL_ERROR,
"MM AUTHENTICATION RESPONSE: invalid: no subscriber\n");
msc_subscr_conn_close(conn, GSM_CAUSE_AUTH_FAILED);
return -EINVAL;
}
is_umts = (msgb_l3len(msg) > sizeof(struct gsm48_hdr) + sizeof(struct gsm48_auth_resp));
if (is_umts)
rc = parse_umts_auth_resp(res, &res_len, conn, msg);
else
rc = parse_gsm_auth_resp(res, &res_len, conn, msg);
if (rc) {
LOGP(DMM, LOGL_ERROR,
"%s: MM AUTHENTICATION RESPONSE: invalid: parsing %s AKA Auth Response"
" failed with rc=%d; dispatching zero length SRES/RES to trigger failure\n",
vlr_subscr_name(conn->vsub), is_umts ? "UMTS" : "GSM", rc);
memset(res, 0, sizeof(res));
res_len = 0;
}
DEBUGP(DMM, "%s: MM %s AUTHENTICATION RESPONSE (%s = %s)\n",
vlr_subscr_name(conn->vsub),
is_umts ? "UMTS" : "GSM", is_umts ? "res" : "sres",
osmo_hexdump_nospc(res, res_len));
return vlr_subscr_rx_auth_resp(conn->vsub, classmark_is_r99(&conn->classmark),
conn->via_ran == RAN_UTRAN_IU,
res, res_len);
}
static int gsm48_rx_mm_auth_fail(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t cause;
uint8_t auts_tag;
uint8_t auts_len;
uint8_t *auts;
if (!conn->vsub) {
LOGP(DMM, LOGL_ERROR,
"MM R99 AUTHENTICATION FAILURE: invalid: no subscriber\n");
msc_subscr_conn_close(conn, GSM_CAUSE_AUTH_FAILED);
return -EINVAL;
}
if (msgb_l3len(msg) < sizeof(*gh) + 1) {
LOGP(DMM, LOGL_ERROR,
"%s: MM R99 AUTHENTICATION FAILURE:"
" l3 length invalid: %u\n",
vlr_subscr_name(conn->vsub), msgb_l3len(msg));
msc_subscr_conn_close(conn, GSM_CAUSE_AUTH_FAILED);
return -EINVAL;
}
cause = gh->data[0];
if (cause != GSM48_REJECT_SYNCH_FAILURE) {
LOGP(DMM, LOGL_INFO,
"%s: MM R99 AUTHENTICATION FAILURE: cause 0x%0x\n",
vlr_subscr_name(conn->vsub), cause);
vlr_subscr_rx_auth_fail(conn->vsub, NULL);
return 0;
}
/* This is a Synch Failure procedure, which should pass an AUTS to
* resynchronize the sequence nr with the HLR. Expecting exactly one
* TLV with 14 bytes of AUTS. */
if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2) {
LOGP(DMM, LOGL_INFO,
"%s: MM R99 AUTHENTICATION FAILURE:"
" invalid Synch Failure: missing AUTS IE\n",
vlr_subscr_name(conn->vsub));
msc_subscr_conn_close(conn, GSM_CAUSE_AUTH_FAILED);
return -EINVAL;
}
auts_tag = gh->data[1];
auts_len = gh->data[2];
auts = &gh->data[3];
if (auts_tag != GSM48_IE_AUTS
|| auts_len != 14) {
LOGP(DMM, LOGL_INFO,
"%s: MM R99 AUTHENTICATION FAILURE:"
" invalid Synch Failure:"
" expected AUTS IE 0x%02x of 14 bytes,"
" got IE 0x%02x of %u bytes\n",
vlr_subscr_name(conn->vsub),
GSM48_IE_AUTS, auts_tag, auts_len);
msc_subscr_conn_close(conn, GSM_CAUSE_AUTH_FAILED);
return -EINVAL;
}
if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2 + auts_len) {
LOGP(DMM, LOGL_INFO,
"%s: MM R99 AUTHENTICATION FAILURE:"
" invalid Synch Failure msg: message truncated (%u)\n",
vlr_subscr_name(conn->vsub), msgb_l3len(msg));
msc_subscr_conn_close(conn, GSM_CAUSE_AUTH_FAILED);
return -EINVAL;
}
/* We have an AUTS IE with exactly 14 bytes of AUTS and the msgb is
* large enough. */
DEBUGP(DMM, "%s: MM R99 AUTHENTICATION SYNCH (AUTS = %s)\n",
vlr_subscr_name(conn->vsub), osmo_hexdump_nospc(auts, 14));
return vlr_subscr_rx_auth_fail(conn->vsub, auts);
}
static int gsm48_rx_mm_tmsi_reall_compl(struct gsm_subscriber_connection *conn)
{
DEBUGP(DMM, "TMSI Reallocation Completed. Subscriber: %s\n",
vlr_subscr_name(conn->vsub));
if (!conn->vsub) {
LOGP(DMM, LOGL_ERROR,
"Rx MM TMSI Reallocation Complete: invalid: no subscriber\n");
return -EINVAL;
}
return vlr_subscr_rx_tmsi_reall_compl(conn->vsub);
}
/* Receive a GSM 04.08 Mobility Management (MM) message */
static int gsm0408_rcv_mm(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
int rc = 0;
switch (gsm48_hdr_msg_type(gh)) {
case GSM48_MT_MM_LOC_UPD_REQUEST:
rc = mm_rx_loc_upd_req(conn, msg);
break;
case GSM48_MT_MM_ID_RESP:
rc = mm_rx_id_resp(conn, msg);
break;
case GSM48_MT_MM_CM_SERV_REQ:
rc = gsm48_rx_mm_serv_req(conn, msg);
break;
case GSM48_MT_MM_STATUS:
rc = gsm48_rx_mm_status(msg);
break;
case GSM48_MT_MM_TMSI_REALL_COMPL:
rc = gsm48_rx_mm_tmsi_reall_compl(conn);
break;
case GSM48_MT_MM_IMSI_DETACH_IND:
rc = gsm48_rx_mm_imsi_detach_ind(conn, msg);
break;
case GSM48_MT_MM_CM_REEST_REQ:
rc = gsm48_rx_cm_reest_req(conn, msg);
break;
case GSM48_MT_MM_AUTH_RESP:
rc = gsm48_rx_mm_auth_resp(conn, msg);
break;
case GSM48_MT_MM_AUTH_FAIL:
rc = gsm48_rx_mm_auth_fail(conn, msg);
break;
default:
LOGP(DMM, LOGL_NOTICE, "Unknown GSM 04.08 MM msg type 0x%02x\n",
gh->msg_type);
break;
}
return rc;
}
static uint8_t *gsm48_cm2_get_mi(uint8_t *classmark2_lv, unsigned int tot_len)
{
/* Check the size for the classmark */
if (tot_len < 1 + *classmark2_lv)
return NULL;
uint8_t *mi_lv = classmark2_lv + *classmark2_lv + 1;
if (tot_len < 2 + *classmark2_lv + mi_lv[0])
return NULL;
return mi_lv;
}
/* Receive a PAGING RESPONSE message from the MS */
static int gsm48_rx_rr_pag_resp(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm_network *net = conn->network;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_pag_resp *resp;
uint8_t *classmark2_lv = gh->data + 1;
uint8_t *mi_lv;
uint8_t mi_type;
char mi_string[GSM48_MI_SIZE];
struct osmo_location_area_id lai;
bool is_utran;
lai.plmn = conn->network->plmn;
lai.lac = conn->lac;
resp = (struct gsm48_pag_resp *) &gh->data[0];
gsm48_paging_extract_mi(resp, msgb_l3len(msg) - sizeof(*gh),
mi_string, &mi_type);
if (msc_subscr_conn_is_establishing_auth_ciph(conn)) {
LOGP(DMM, LOGL_ERROR,
"Ignoring Paging Response, conn already busy establishing authenticity\n");
return 0;
}
if (msc_subscr_conn_is_accepted(conn)) {
LOGP(DMM, LOGL_ERROR, "Ignoring Paging Response, conn already established\n");
return 0;
}
DEBUGP(DRR, "PAGING RESPONSE: MI(%s)=%s\n", gsm48_mi_type_name(mi_type), mi_string);
mi_lv = gsm48_cm2_get_mi(classmark2_lv, msgb_l3len(msg) - sizeof(*gh));
if (!mi_lv) {
LOGP(DRR, LOGL_ERROR, "PAGING RESPONSE: invalid Mobile Identity\n");
return -1;
}
msc_subscr_conn_update_id(conn, COMPLETE_LAYER3_PAGING_RESP, mi_string);
memcpy(conn->classmark.classmark2, classmark2_lv+1, *classmark2_lv);
conn->classmark.classmark2_len = *classmark2_lv;
is_utran = (conn->via_ran == RAN_UTRAN_IU);
vlr_proc_acc_req(conn->fi,
SUBSCR_CONN_E_ACCEPTED, SUBSCR_CONN_E_CN_CLOSE, NULL,
net->vlr, conn,
VLR_PR_ARQ_T_PAGING_RESP, mi_lv, &lai,
is_utran || conn->network->authentication_required,
is_utran || conn->network->a5_encryption_mask > 0x01,
classmark_is_r99(&conn->classmark),
is_utran);
msc_subscr_conn_complete_layer_3(conn);
return 0;
}
static int gsm48_rx_rr_app_info(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t apdu_id_flags;
uint8_t apdu_len;
uint8_t *apdu_data;
apdu_id_flags = gh->data[0];
apdu_len = gh->data[1];
apdu_data = gh->data+2;
DEBUGP(DRR, "RX APPLICATION INFO id/flags=0x%02x apdu_len=%u apdu=%s\n",
apdu_id_flags, apdu_len, osmo_hexdump(apdu_data, apdu_len));
/* we're not using the app info blob anywhere, so ignore. */
#if 0
return db_apdu_blob_store(conn->subscr, apdu_id_flags, apdu_len, apdu_data);
#else
return 0;
#endif
}
/* Receive a GSM 04.08 Radio Resource (RR) message */
static int gsm0408_rcv_rr(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
int rc = 0;
switch (gh->msg_type) {
case GSM48_MT_RR_PAG_RESP:
rc = gsm48_rx_rr_pag_resp(conn, msg);
break;
case GSM48_MT_RR_APP_INFO:
rc = gsm48_rx_rr_app_info(conn, msg);
break;
default:
LOGP(DRR, LOGL_NOTICE, "MSC: Unimplemented %s GSM 04.08 RR "
"message\n", gsm48_rr_msg_name(gh->msg_type));
break;
}
return rc;
}
int gsm48_send_rr_app_info(struct gsm_subscriber_connection *conn, uint8_t apdu_id,
uint8_t apdu_len, const uint8_t *apdu)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 APP INF");
struct gsm48_hdr *gh;
DEBUGP(DRR, "TX APPLICATION INFO id=0x%02x, len=%u\n",
apdu_id, apdu_len);
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2 + apdu_len);
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_APP_INFO;
gh->data[0] = apdu_id;
gh->data[1] = apdu_len;
memcpy(gh->data+2, apdu, apdu_len);
return gsm48_conn_sendmsg(msg, conn, NULL);
}
/* FIXME: this count_statistics is a state machine behaviour. we should convert
* the complete call control into a state machine. Afterwards we can move this
* code into state transitions.
*/
static void count_statistics(struct gsm_trans *trans, int new_state)
{
int old_state = trans->cc.state;
struct rate_ctr_group *msc = trans->net->msc_ctrs;
if (old_state == new_state)
return;
/* state incoming */
switch (new_state) {
case GSM_CSTATE_ACTIVE:
osmo_counter_inc(trans->net->active_calls);
rate_ctr_inc(&msc->ctr[MSC_CTR_CALL_ACTIVE]);
break;
}
/* state outgoing */
switch (old_state) {
case GSM_CSTATE_ACTIVE:
osmo_counter_dec(trans->net->active_calls);
if (new_state == GSM_CSTATE_DISCONNECT_REQ ||
new_state == GSM_CSTATE_DISCONNECT_IND)
rate_ctr_inc(&msc->ctr[MSC_CTR_CALL_COMPLETE]);
else
rate_ctr_inc(&msc->ctr[MSC_CTR_CALL_INCOMPLETE]);
break;
}
}
/* 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 void new_cc_state(struct gsm_trans *trans, int state)
{
if (state > 31 || state < 0)
return;
DEBUGP(DCC, "(ti %02x sub %s) new state %s -> %s\n",
trans->transaction_id,
vlr_subscr_name(trans->vsub),
gsm48_cc_state_name(trans->cc.state),
gsm48_cc_state_name(state));
count_statistics(trans, state);
trans->cc.state = state;
}
static int gsm48_cc_tx_status(struct gsm_trans *trans, void *arg)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC STATUS");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
uint8_t *cause, *call_state;
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_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_tx_simple(struct gsm_subscriber_connection *conn,
uint8_t pdisc, uint8_t msg_type)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 TX SIMPLE");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = pdisc;
gh->msg_type = msg_type;
return gsm48_conn_sendmsg(msg, conn, NULL);
}
static void gsm48_stop_cc_timer(struct gsm_trans *trans)
{
if (osmo_timer_pending(&trans->cc.timer)) {
DEBUGP(DCC, "stopping pending timer T%x\n", trans->cc.Tcurrent);
osmo_timer_del(&trans->cc.timer);
trans->cc.Tcurrent = 0;
}
}
static int mncc_recvmsg(struct gsm_network *net, struct gsm_trans *trans,
int msg_type, struct gsm_mncc *mncc)
{
struct msgb *msg;
unsigned char *data;
DEBUGP(DMNCC, "transmit message %s\n", get_mncc_name(msg_type));
#if BEFORE_MSCSPLIT
/* Re-enable this log output once we can obtain this information via
* A-interface, see OS#2391. */
if (trans)
if (trans->conn && trans->conn->lchan)
DEBUGP(DCC, "(bts %d trx %d ts %d ti %x sub %s) "
"Sending '%s' to MNCC.\n",
trans->conn->lchan->ts->trx->bts->nr,
trans->conn->lchan->ts->trx->nr,
trans->conn->lchan->ts->nr, trans->transaction_id,
vlr_subscr_msisdn_or_name(trans->vsub),
get_mncc_name(msg_type));
else
DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) "
"Sending '%s' to MNCC.\n",
vlr_subscr_msisdn_or_name(trans->vsub),
get_mncc_name(msg_type));
else
DEBUGP(DCC, "(bts - trx - ts - ti -- sub -) "
"Sending '%s' to MNCC.\n", get_mncc_name(msg_type));
#else
DEBUGP(DCC, "Sending '%s' to MNCC.\n", get_mncc_name(msg_type));
#endif
mncc->msg_type = msg_type;
msg = msgb_alloc(sizeof(struct gsm_mncc), "MNCC");
if (!msg)
return -ENOMEM;
data = msgb_put(msg, sizeof(struct gsm_mncc));
memcpy(data, mncc, sizeof(struct gsm_mncc));
cc_tx_to_mncc(net, msg);
return 0;
}
int mncc_release_ind(struct gsm_network *net, struct gsm_trans *trans,
uint32_t callref, int location, int value)
{
struct gsm_mncc rel;
memset(&rel, 0, sizeof(rel));
rel.callref = callref;
mncc_set_cause(&rel, location, value);
if (trans && trans->cc.state == GSM_CSTATE_RELEASE_REQ)
return mncc_recvmsg(net, trans, MNCC_REL_CNF, &rel);
return mncc_recvmsg(net, trans, MNCC_REL_IND, &rel);
}
/* Call Control Specific transaction release.
* gets called by trans_free, DO NOT CALL YOURSELF! */
void _gsm48_cc_trans_free(struct gsm_trans *trans)
{
gsm48_stop_cc_timer(trans);
/* Initiate the teardown of the related connections on the MGW */
msc_mgcp_call_release(trans);
/* send release to L4, if callref still exists */
if (trans->callref) {
/* Ressource unavailable */
mncc_release_ind(trans->net, trans, trans->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
/* This is a final freeing of the transaction. The MNCC release may have triggered the
* T308 release timer, but we don't have the luxury of graceful CC Release here. */
gsm48_stop_cc_timer(trans);
}
if (trans->cc.state != GSM_CSTATE_NULL)
new_cc_state(trans, GSM_CSTATE_NULL);
}
static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg);
/* 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 *_conn, void *_transt)
{
struct gsm_subscriber_connection *conn = _conn;
struct gsm_trans *transt = _transt;
enum gsm_paging_event paging_event = event;
OSMO_ASSERT(!transt->conn);
switch (paging_event) {
case GSM_PAGING_SUCCEEDED:
DEBUGP(DCC, "Paging subscr %s succeeded!\n",
vlr_subscr_msisdn_or_name(transt->vsub));
OSMO_ASSERT(conn);
/* Assign conn */
transt->conn = msc_subscr_conn_get(conn, MSC_CONN_USE_TRANS_CC);
transt->paging_request = NULL;
/* send SETUP request to called party */
gsm48_cc_tx_setup(transt, &transt->cc.msg);
break;
case GSM_PAGING_EXPIRED:
case GSM_PAGING_BUSY:
DEBUGP(DCC, "Paging subscr %s %s!\n",
vlr_subscr_msisdn_or_name(transt->vsub),
paging_event == GSM_PAGING_EXPIRED ? "expired" : "busy");
/* Temporarily out of order */
mncc_release_ind(transt->net, transt,
transt->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_DEST_OOO);
transt->callref = 0;
transt->paging_request = NULL;
trans_free(transt);
break;
}
return 0;
}
/* bridge channels of two transactions */
static int tch_bridge(struct gsm_network *net, struct gsm_mncc_bridge *bridge)
{
struct gsm_trans *trans1 = trans_find_by_callref(net, bridge->callref[0]);
struct gsm_trans *trans2 = trans_find_by_callref(net, bridge->callref[1]);
int rc;
if (!trans1 || !trans2)
return -EIO;
if (!trans1->conn || !trans2->conn)
return -EIO;
/* Which subscriber do we want to track trans1 or trans2? */
log_set_context(LOG_CTX_VLR_SUBSCR, trans1->vsub);
/* Bridge RTP streams */
rc = msc_mgcp_call_complete(trans1, trans2->conn->rtp.local_port_cn,
trans2->conn->rtp.local_addr_cn);
if (rc)
return -EINVAL;
rc = msc_mgcp_call_complete(trans2, trans1->conn->rtp.local_port_cn,
trans1->conn->rtp.local_addr_cn);
if (rc)
return -EINVAL;
return 0;
}
static int gsm48_cc_rx_status_enq(struct gsm_trans *trans, struct msgb *msg)
{
DEBUGP(DCC, "-> STATUS ENQ\n");
return gsm48_cc_tx_status(trans, msg);
}
static int gsm48_cc_tx_release(struct gsm_trans *trans, void *arg);
static int gsm48_cc_tx_disconnect(struct gsm_trans *trans, void *arg);
static void gsm48_cc_timeout(void *arg)
{
struct gsm_trans *trans = arg;
int disconnect = 0, release = 0;
int mo_cause = GSM48_CC_CAUSE_RECOVERY_TIMER;
int mo_location = GSM48_CAUSE_LOC_USER;
int l4_cause = GSM48_CC_CAUSE_NORMAL_UNSPEC;
int l4_location = GSM48_CAUSE_LOC_PRN_S_LU;
struct gsm_mncc mo_rel, l4_rel;
memset(&mo_rel, 0, sizeof(struct gsm_mncc));
mo_rel.callref = trans->callref;
memset(&l4_rel, 0, sizeof(struct gsm_mncc));
l4_rel.callref = trans->callref;
switch(trans->cc.Tcurrent) {
case 0x303:
release = 1;
l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND;
break;
case 0x310:
disconnect = 1;
l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND;
break;
case 0x313:
disconnect = 1;
/* unknown, did not find it in the specs */
break;
case 0x301:
disconnect = 1;
l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND;
break;
case 0x308:
if (!trans->cc.T308_second) {
/* restart T308 a second time */
gsm48_cc_tx_release(trans, &trans->cc.msg);
trans->cc.T308_second = 1;
break; /* stay in release state */
}
trans_free(trans);
return;
case 0x306:
release = 1;
mo_cause = trans->cc.msg.cause.value;
mo_location = trans->cc.msg.cause.location;
break;
case 0x323:
disconnect = 1;
break;
default:
release = 1;
}
if (release && trans->callref) {
/* process release towards layer 4 */
mncc_release_ind(trans->net, trans, trans->callref,
l4_location, l4_cause);
trans->callref = 0;
}
if (disconnect && trans->callref) {
/* process disconnect towards layer 4 */
mncc_set_cause(&l4_rel, l4_location, l4_cause);
mncc_recvmsg(trans->net, trans, MNCC_DISC_IND, &l4_rel);
}
/* process disconnect towards mobile station */
if (disconnect || release) {
mncc_set_cause(&mo_rel, mo_location, mo_cause);
mo_rel.cause.diag[0] = ((trans->cc.Tcurrent & 0xf00) >> 8) + '0';
mo_rel.cause.diag[1] = ((trans->cc.Tcurrent & 0x0f0) >> 4) + '0';
mo_rel.cause.diag[2] = (trans->cc.Tcurrent & 0x00f) + '0';
mo_rel.cause.diag_len = 3;
if (disconnect)
gsm48_cc_tx_disconnect(trans, &mo_rel);
if (release)
gsm48_cc_tx_release(trans, &mo_rel);
}
}
/* disconnect both calls from the bridge */
static inline void disconnect_bridge(struct gsm_network *net,
struct gsm_mncc_bridge *bridge, int err)
{
struct gsm_trans *trans0 = trans_find_by_callref(net, bridge->callref[0]);
struct gsm_trans *trans1 = trans_find_by_callref(net, bridge->callref[1]);
struct gsm_mncc mx_rel;
if (!trans0 || !trans1)
return;
DEBUGP(DCC, "Failed to bridge TCH for calls %x <-> %x :: %s \n",
trans0->callref, trans1->callref, strerror(err));
memset(&mx_rel, 0, sizeof(struct gsm_mncc));
mncc_set_cause(&mx_rel, GSM48_CAUSE_LOC_INN_NET,
GSM48_CC_CAUSE_CHAN_UNACCEPT);
mx_rel.callref = trans0->callref;
gsm48_cc_tx_disconnect(trans0, &mx_rel);
mx_rel.callref = trans1->callref;
gsm48_cc_tx_disconnect(trans1, &mx_rel);
}
static void gsm48_start_cc_timer(struct gsm_trans *trans, int current,
int sec, int micro)
{
DEBUGP(DCC, "starting timer T%x with %d seconds\n", current, sec);
osmo_timer_setup(&trans->cc.timer, gsm48_cc_timeout, trans);
osmo_timer_schedule(&trans->cc.timer, sec, micro);
trans->cc.Tcurrent = current;
}
static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t msg_type = gsm48_hdr_msg_type(gh);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc setup;
memset(&setup, 0, sizeof(struct gsm_mncc));
setup.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
/* emergency setup is identified by msg_type */
if (msg_type == GSM48_MT_CC_EMERG_SETUP) {
setup.fields |= MNCC_F_EMERGENCY;
setup.emergency = 1;
/* use destination number as configured by user (if any) */
if (trans->net->emergency.route_to_msisdn) {
setup.fields |= MNCC_F_CALLED;
setup.called.type = 0; /* unknown */
setup.called.plan = 0; /* unknown */
OSMO_STRLCPY_ARRAY(setup.called.number,
trans->net->emergency.route_to_msisdn);
}
}
/* use subscriber as calling party number */
setup.fields |= MNCC_F_CALLING;
OSMO_STRLCPY_ARRAY(setup.calling.number, trans->vsub->msisdn);
OSMO_STRLCPY_ARRAY(setup.imsi, trans->vsub->imsi);
/* bearer capability */
if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) {
setup.fields |= MNCC_F_BEARER_CAP;
gsm48_decode_bearer_cap(&setup.bearer_cap,
TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1);
/* Create a copy of the bearer capability
* in the transaction struct, so we can use
* this information later */
memcpy(&trans->bearer_cap,&setup.bearer_cap,
sizeof(trans->bearer_cap));
}
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
setup.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&setup.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* called party bcd number */
if (TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) {
setup.fields |= MNCC_F_CALLED;
gsm48_decode_called(&setup.called,
TLVP_VAL(&tp, GSM48_IE_CALLED_BCD)-1);
}
/* user-user */
if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) {
setup.fields |= MNCC_F_USERUSER;
gsm48_decode_useruser(&setup.useruser,
TLVP_VAL(&tp, GSM48_IE_USER_USER)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
setup.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&setup.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
/* CLIR suppression */
if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_SUPP))
setup.clir.sup = 1;
/* CLIR invocation */
if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_INVOC))
setup.clir.inv = 1;
/* cc cap */
if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) {
setup.fields |= MNCC_F_CCCAP;
gsm48_decode_cccap(&setup.cccap,
TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1);
}
new_cc_state(trans, GSM_CSTATE_INITIATED);
LOGP(DCC, setup.emergency ? LOGL_NOTICE : LOGL_INFO, "Subscriber %s (%s) sends %sSETUP to %s\n",
vlr_subscr_name(trans->vsub), trans->vsub->msisdn, setup.emergency ? "EMERGENCY_" : "",
setup.called.number);
rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MO_SETUP]);
/* indicate setup to MNCC */
mncc_recvmsg(trans->net, trans, MNCC_SETUP_IND, &setup);
/* MNCC code will modify the channel asynchronously, we should
* ipaccess-bind only after the modification has been made to the
* lchan->tch_mode */
return 0;
}
static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC STUP");
struct gsm48_hdr *gh;
struct gsm_mncc *setup = arg;
int rc, trans_id;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
/* transaction id must not be assigned */
if (trans->transaction_id != 0xff) { /* unasssigned */
DEBUGP(DCC, "TX Setup with assigned transaction. "
"This is not allowed!\n");
/* Temporarily out of order */
rc = mncc_release_ind(trans->net, trans, trans->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
trans->callref = 0;
trans_free(trans);
return rc;
}
/* Get free transaction_id */
trans_id = trans_assign_trans_id(trans->net, trans->vsub,
GSM48_PDISC_CC, 0);
if (trans_id < 0) {
/* no free transaction ID */
rc = mncc_release_ind(trans->net, trans, trans->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
trans->callref = 0;
trans_free(trans);
return rc;
}
trans->transaction_id = trans_id;
gh->msg_type = GSM48_MT_CC_SETUP;
gsm48_start_cc_timer(trans, 0x303, GSM48_T303);
/* bearer capability */
if (setup->fields & MNCC_F_BEARER_CAP) {
/* Create a copy of the bearer capability in the transaction struct, so we
* can use this information later */
memcpy(&trans->bearer_cap, &setup->bearer_cap, sizeof(trans->bearer_cap));
gsm48_encode_bearer_cap(msg, 0, &setup->bearer_cap);
}
/* facility */
if (setup->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &setup->facility);
/* progress */
if (setup->fields & MNCC_F_PROGRESS)
gsm48_encode_progress(msg, 0, &setup->progress);
/* calling party BCD number */
if (setup->fields & MNCC_F_CALLING)
gsm48_encode_calling(msg, &setup->calling);
/* called party BCD number */
if (setup->fields & MNCC_F_CALLED)
gsm48_encode_called(msg, &setup->called);
/* user-user */
if (setup->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &setup->useruser);
/* redirecting party BCD number */
if (setup->fields & MNCC_F_REDIRECTING)
gsm48_encode_redirecting(msg, &setup->redirecting);
/* signal */
if (setup->fields & MNCC_F_SIGNAL)
gsm48_encode_signal(msg, setup->signal);
new_cc_state(trans, GSM_CSTATE_CALL_PRESENT);
rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MT_SETUP]);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_call_conf(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc call_conf;
int rc;
gsm48_stop_cc_timer(trans);
gsm48_start_cc_timer(trans, 0x310, GSM48_T310);
memset(&call_conf, 0, sizeof(struct gsm_mncc));
call_conf.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
#if 0
/* repeat */
if (TLVP_PRESENT(&tp, GSM48_IE_REPEAT_CIR))
call_conf.repeat = 1;
if (TLVP_PRESENT(&tp, GSM48_IE_REPEAT_SEQ))
call_conf.repeat = 2;
#endif
/* bearer capability */
if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) {
call_conf.fields |= MNCC_F_BEARER_CAP;
gsm48_decode_bearer_cap(&call_conf.bearer_cap,
TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1);
/* Create a copy of the bearer capability
* in the transaction struct, so we can use
* this information later */
memcpy(&trans->bearer_cap,&call_conf.bearer_cap,
sizeof(trans->bearer_cap));
}
/* cause */
if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) {
call_conf.fields |= MNCC_F_CAUSE;
gsm48_decode_cause(&call_conf.cause,
TLVP_VAL(&tp, GSM48_IE_CAUSE)-1);
}
/* cc cap */
if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) {
call_conf.fields |= MNCC_F_CCCAP;
gsm48_decode_cccap(&call_conf.cccap,
TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1);
}
/* IMSI of called subscriber */
OSMO_STRLCPY_ARRAY(call_conf.imsi, trans->vsub->imsi);
new_cc_state(trans, GSM_CSTATE_MO_TERM_CALL_CONF);
/* Assign call (if not done yet) */
if (trans->assignment_done == false) {
rc = msc_mgcp_call_assignment(trans);
trans->assignment_done = true;
}
else
rc = 0;
/* don't continue, if there were problems with
* the call assignment. */
if (rc)
return rc;
return mncc_recvmsg(trans->net, trans, MNCC_CALL_CONF_IND,
&call_conf);
}
static int gsm48_cc_tx_call_proc_and_assign(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *proceeding = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC PROC");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
int rc;
gh->msg_type = GSM48_MT_CC_CALL_PROC;
new_cc_state(trans, GSM_CSTATE_MO_CALL_PROC);
/* bearer capability */
if (proceeding->fields & MNCC_F_BEARER_CAP) {
gsm48_encode_bearer_cap(msg, 0, &proceeding->bearer_cap);
memcpy(&trans->bearer_cap, &proceeding->bearer_cap, sizeof(trans->bearer_cap));
}
/* facility */
if (proceeding->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &proceeding->facility);
/* progress */
if (proceeding->fields & MNCC_F_PROGRESS)
gsm48_encode_progress(msg, 0, &proceeding->progress);
rc = gsm48_conn_sendmsg(msg, trans->conn, trans);
if (rc)
return rc;
/* Assign call (if not done yet) */
if (trans->assignment_done == false) {
rc = msc_mgcp_call_assignment(trans);
trans->assignment_done = true;
}
else
rc = 0;
return rc;
}
static int gsm48_cc_rx_alerting(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc alerting;
gsm48_stop_cc_timer(trans);
gsm48_start_cc_timer(trans, 0x301, GSM48_T301);
memset(&alerting, 0, sizeof(struct gsm_mncc));
alerting.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
alerting.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&alerting.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* progress */
if (TLVP_PRESENT(&tp, GSM48_IE_PROGR_IND)) {
alerting.fields |= MNCC_F_PROGRESS;
gsm48_decode_progress(&alerting.progress,
TLVP_VAL(&tp, GSM48_IE_PROGR_IND)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
alerting.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&alerting.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
new_cc_state(trans, GSM_CSTATE_CALL_RECEIVED);
return mncc_recvmsg(trans->net, trans, MNCC_ALERT_IND,
&alerting);
}
static int gsm48_cc_tx_alerting(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *alerting = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC ALERT");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_ALERTING;
/* facility */
if (alerting->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &alerting->facility);
/* progress */
if (alerting->fields & MNCC_F_PROGRESS)
gsm48_encode_progress(msg, 0, &alerting->progress);
/* user-user */
if (alerting->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &alerting->useruser);
new_cc_state(trans, GSM_CSTATE_CALL_DELIVERED);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_progress(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *progress = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC PROGRESS");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_PROGRESS;
/* progress */
gsm48_encode_progress(msg, 1, &progress->progress);
/* user-user */
if (progress->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &progress->useruser);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_connect(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *connect = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSN 04.08 CC CON");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_CONNECT;
gsm48_stop_cc_timer(trans);
gsm48_start_cc_timer(trans, 0x313, GSM48_T313);
/* facility */
if (connect->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &connect->facility);
/* progress */
if (connect->fields & MNCC_F_PROGRESS)
gsm48_encode_progress(msg, 0, &connect->progress);
/* connected number */
if (connect->fields & MNCC_F_CONNECTED)
gsm48_encode_connected(msg, &connect->connected);
/* user-user */
if (connect->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &connect->useruser);
new_cc_state(trans, GSM_CSTATE_CONNECT_IND);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_connect(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc connect;
gsm48_stop_cc_timer(trans);
memset(&connect, 0, sizeof(struct gsm_mncc));
connect.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
/* use subscriber as connected party number */
connect.fields |= MNCC_F_CONNECTED;
OSMO_STRLCPY_ARRAY(connect.connected.number, trans->vsub->msisdn);
OSMO_STRLCPY_ARRAY(connect.imsi, trans->vsub->imsi);
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
connect.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&connect.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* user-user */
if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) {
connect.fields |= MNCC_F_USERUSER;
gsm48_decode_useruser(&connect.useruser,
TLVP_VAL(&tp, GSM48_IE_USER_USER)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
connect.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&connect.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
new_cc_state(trans, GSM_CSTATE_CONNECT_REQUEST);
rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MT_CONNECT]);
return mncc_recvmsg(trans->net, trans, MNCC_SETUP_CNF, &connect);
}
static int gsm48_cc_rx_connect_ack(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm_mncc connect_ack;
gsm48_stop_cc_timer(trans);
new_cc_state(trans, GSM_CSTATE_ACTIVE);
rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MO_CONNECT_ACK]);
memset(&connect_ack, 0, sizeof(struct gsm_mncc));
connect_ack.callref = trans->callref;
return mncc_recvmsg(trans->net, trans, MNCC_SETUP_COMPL_IND,
&connect_ack);
}
static int gsm48_cc_tx_connect_ack(struct gsm_trans *trans, void *arg)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC CON ACK");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_CONNECT_ACK;
new_cc_state(trans, GSM_CSTATE_ACTIVE);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_disconnect(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc disc;
gsm48_stop_cc_timer(trans);
new_cc_state(trans, GSM_CSTATE_DISCONNECT_REQ);
memset(&disc, 0, sizeof(struct gsm_mncc));
disc.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_CAUSE, 0);
/* cause */
if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) {
disc.fields |= MNCC_F_CAUSE;
gsm48_decode_cause(&disc.cause,
TLVP_VAL(&tp, GSM48_IE_CAUSE)-1);
}
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
disc.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&disc.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* user-user */
if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) {
disc.fields |= MNCC_F_USERUSER;
gsm48_decode_useruser(&disc.useruser,
TLVP_VAL(&tp, GSM48_IE_USER_USER)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
disc.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&disc.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
return mncc_recvmsg(trans->net, trans, MNCC_DISC_IND, &disc);
}
static struct gsm_mncc_cause default_cause = {
.location = GSM48_CAUSE_LOC_PRN_S_LU,
.coding = 0,
.rec = 0,
.rec_val = 0,
.value = GSM48_CC_CAUSE_NORMAL_UNSPEC,
.diag_len = 0,
.diag = { 0 },
};
static int gsm48_cc_tx_disconnect(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *disc = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC DISC");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_DISCONNECT;
gsm48_stop_cc_timer(trans);
gsm48_start_cc_timer(trans, 0x306, GSM48_T306);
/* cause */
if (disc->fields & MNCC_F_CAUSE)
gsm48_encode_cause(msg, 1, &disc->cause);
else
gsm48_encode_cause(msg, 1, &default_cause);
/* facility */
if (disc->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &disc->facility);
/* progress */
if (disc->fields & MNCC_F_PROGRESS)
gsm48_encode_progress(msg, 0, &disc->progress);
/* user-user */
if (disc->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &disc->useruser);
/* store disconnect cause for T306 expiry */
memcpy(&trans->cc.msg, disc, sizeof(struct gsm_mncc));
new_cc_state(trans, GSM_CSTATE_DISCONNECT_IND);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_release(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc rel;
int rc;
gsm48_stop_cc_timer(trans);
memset(&rel, 0, sizeof(struct gsm_mncc));
rel.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
/* cause */
if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) {
rel.fields |= MNCC_F_CAUSE;
gsm48_decode_cause(&rel.cause,
TLVP_VAL(&tp, GSM48_IE_CAUSE)-1);
}
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
rel.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&rel.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* user-user */
if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) {
rel.fields |= MNCC_F_USERUSER;
gsm48_decode_useruser(&rel.useruser,
TLVP_VAL(&tp, GSM48_IE_USER_USER)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
rel.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&rel.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
if (trans->cc.state == GSM_CSTATE_RELEASE_REQ) {
/* release collision 5.4.5 */
rc = mncc_recvmsg(trans->net, trans, MNCC_REL_CNF, &rel);
} else {
rc = gsm48_tx_simple(trans->conn,
GSM48_PDISC_CC | (trans->transaction_id << 4),
GSM48_MT_CC_RELEASE_COMPL);
rc = mncc_recvmsg(trans->net, trans, MNCC_REL_IND, &rel);
}
new_cc_state(trans, GSM_CSTATE_NULL);
trans->callref = 0;
trans_free(trans);
return rc;
}
static int gsm48_cc_tx_release(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *rel = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC REL");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_RELEASE;
gsm48_stop_cc_timer(trans);
gsm48_start_cc_timer(trans, 0x308, GSM48_T308);
/* cause */
if (rel->fields & MNCC_F_CAUSE)
gsm48_encode_cause(msg, 0, &rel->cause);
/* facility */
if (rel->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &rel->facility);
/* user-user */
if (rel->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &rel->useruser);
trans->cc.T308_second = 0;
memcpy(&trans->cc.msg, rel, sizeof(struct gsm_mncc));
if (trans->cc.state != GSM_CSTATE_RELEASE_REQ)
new_cc_state(trans, GSM_CSTATE_RELEASE_REQ);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_release_compl(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc rel;
int rc = 0;
gsm48_stop_cc_timer(trans);
memset(&rel, 0, sizeof(struct gsm_mncc));
rel.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
/* cause */
if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) {
rel.fields |= MNCC_F_CAUSE;
gsm48_decode_cause(&rel.cause,
TLVP_VAL(&tp, GSM48_IE_CAUSE)-1);
}
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
rel.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&rel.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* user-user */
if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) {
rel.fields |= MNCC_F_USERUSER;
gsm48_decode_useruser(&rel.useruser,
TLVP_VAL(&tp, GSM48_IE_USER_USER)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
rel.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&rel.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
if (trans->callref) {
switch (trans->cc.state) {
case GSM_CSTATE_CALL_PRESENT:
rc = mncc_recvmsg(trans->net, trans,
MNCC_REJ_IND, &rel);
break;
case GSM_CSTATE_RELEASE_REQ:
rc = mncc_recvmsg(trans->net, trans,
MNCC_REL_CNF, &rel);
break;
default:
rc = mncc_recvmsg(trans->net, trans,
MNCC_REL_IND, &rel);
}
}
trans->callref = 0;
trans_free(trans);
return rc;
}
static int gsm48_cc_tx_release_compl(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *rel = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC REL COMPL");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
int ret;
gh->msg_type = GSM48_MT_CC_RELEASE_COMPL;
trans->callref = 0;
gsm48_stop_cc_timer(trans);
/* cause */
if (rel->fields & MNCC_F_CAUSE)
gsm48_encode_cause(msg, 0, &rel->cause);
/* facility */
if (rel->fields & MNCC_F_FACILITY)
gsm48_encode_facility(msg, 0, &rel->facility);
/* user-user */
if (rel->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 0, &rel->useruser);
ret = gsm48_conn_sendmsg(msg, trans->conn, trans);
trans_free(trans);
return ret;
}
static int gsm48_cc_rx_facility(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc fac;
memset(&fac, 0, sizeof(struct gsm_mncc));
fac.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_FACILITY, 0);
/* facility */
if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) {
fac.fields |= MNCC_F_FACILITY;
gsm48_decode_facility(&fac.facility,
TLVP_VAL(&tp, GSM48_IE_FACILITY)-1);
}
/* ss-version */
if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) {
fac.fields |= MNCC_F_SSVERSION;
gsm48_decode_ssversion(&fac.ssversion,
TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1);
}
return mncc_recvmsg(trans->net, trans, MNCC_FACILITY_IND, &fac);
}
static int gsm48_cc_tx_facility(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *fac = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC FAC");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_FACILITY;
/* facility */
gsm48_encode_facility(msg, 1, &fac->facility);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_hold(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm_mncc hold;
memset(&hold, 0, sizeof(struct gsm_mncc));
hold.callref = trans->callref;
return mncc_recvmsg(trans->net, trans, MNCC_HOLD_IND, &hold);
}
static int gsm48_cc_tx_hold_ack(struct gsm_trans *trans, void *arg)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC HLD ACK");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_HOLD_ACK;
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_hold_rej(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *hold_rej = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC HLD REJ");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_HOLD_REJ;
/* cause */
if (hold_rej->fields & MNCC_F_CAUSE)
gsm48_encode_cause(msg, 1, &hold_rej->cause);
else
gsm48_encode_cause(msg, 1, &default_cause);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_retrieve(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm_mncc retrieve;
memset(&retrieve, 0, sizeof(struct gsm_mncc));
retrieve.callref = trans->callref;
return mncc_recvmsg(trans->net, trans, MNCC_RETRIEVE_IND,
&retrieve);
}
static int gsm48_cc_tx_retrieve_ack(struct gsm_trans *trans, void *arg)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC RETR ACK");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_RETR_ACK;
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_retrieve_rej(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *retrieve_rej = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC RETR REJ");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_RETR_REJ;
/* cause */
if (retrieve_rej->fields & MNCC_F_CAUSE)
gsm48_encode_cause(msg, 1, &retrieve_rej->cause);
else
gsm48_encode_cause(msg, 1, &default_cause);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_start_dtmf(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc dtmf;
memset(&dtmf, 0, sizeof(struct gsm_mncc));
dtmf.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
/* keypad facility */
if (TLVP_PRESENT(&tp, GSM48_IE_KPD_FACILITY)) {
dtmf.fields |= MNCC_F_KEYPAD;
gsm48_decode_keypad(&dtmf.keypad,
TLVP_VAL(&tp, GSM48_IE_KPD_FACILITY)-1);
}
return mncc_recvmsg(trans->net, trans, MNCC_START_DTMF_IND, &dtmf);
}
static int gsm48_cc_tx_start_dtmf_ack(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *dtmf = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF ACK");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_START_DTMF_ACK;
/* keypad */
if (dtmf->fields & MNCC_F_KEYPAD)
gsm48_encode_keypad(msg, dtmf->keypad);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_start_dtmf_rej(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *dtmf = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF REJ");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_START_DTMF_REJ;
/* cause */
if (dtmf->fields & MNCC_F_CAUSE)
gsm48_encode_cause(msg, 1, &dtmf->cause);
else
gsm48_encode_cause(msg, 1, &default_cause);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_stop_dtmf_ack(struct gsm_trans *trans, void *arg)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF STP ACK");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_STOP_DTMF_ACK;
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_stop_dtmf(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm_mncc dtmf;
memset(&dtmf, 0, sizeof(struct gsm_mncc));
dtmf.callref = trans->callref;
return mncc_recvmsg(trans->net, trans, MNCC_STOP_DTMF_IND, &dtmf);
}
static int gsm48_cc_rx_modify(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc modify;
memset(&modify, 0, sizeof(struct gsm_mncc));
modify.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, 0);
/* bearer capability */
if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) {
modify.fields |= MNCC_F_BEARER_CAP;
gsm48_decode_bearer_cap(&modify.bearer_cap,
TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1);
/* Create a copy of the bearer capability
* in the transaction struct, so we can use
* this information later */
memcpy(&trans->bearer_cap,&modify.bearer_cap,
sizeof(trans->bearer_cap));
}
new_cc_state(trans, GSM_CSTATE_MO_ORIG_MODIFY);
return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_IND, &modify);
}
static int gsm48_cc_tx_modify(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *modify = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_MODIFY;
gsm48_start_cc_timer(trans, 0x323, GSM48_T323);
/* bearer capability */
gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap);
memcpy(&trans->bearer_cap, &modify->bearer_cap, sizeof(trans->bearer_cap));
new_cc_state(trans, GSM_CSTATE_MO_TERM_MODIFY);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_modify_complete(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc modify;
gsm48_stop_cc_timer(trans);
memset(&modify, 0, sizeof(struct gsm_mncc));
modify.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, 0);
/* bearer capability */
if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) {
modify.fields |= MNCC_F_BEARER_CAP;
gsm48_decode_bearer_cap(&modify.bearer_cap,
TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1);
/* Create a copy of the bearer capability
* in the transaction struct, so we can use
* this information later */
memcpy(&trans->bearer_cap,&modify.bearer_cap,
sizeof(trans->bearer_cap));
}
new_cc_state(trans, GSM_CSTATE_ACTIVE);
return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_CNF, &modify);
}
static int gsm48_cc_tx_modify_complete(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *modify = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD COMPL");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_MODIFY_COMPL;
/* bearer capability */
gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap);
memcpy(&trans->bearer_cap, &modify->bearer_cap, sizeof(trans->bearer_cap));
new_cc_state(trans, GSM_CSTATE_ACTIVE);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_modify_reject(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc modify;
gsm48_stop_cc_timer(trans);
memset(&modify, 0, sizeof(struct gsm_mncc));
modify.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, GSM48_IE_CAUSE);
/* bearer capability */
if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) {
modify.fields |= GSM48_IE_BEARER_CAP;
gsm48_decode_bearer_cap(&modify.bearer_cap,
TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1);
/* Create a copy of the bearer capability
* in the transaction struct, so we can use
* this information later */
memcpy(&trans->bearer_cap,&modify.bearer_cap,
sizeof(trans->bearer_cap));
}
/* cause */
if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) {
modify.fields |= MNCC_F_CAUSE;
gsm48_decode_cause(&modify.cause,
TLVP_VAL(&tp, GSM48_IE_CAUSE)-1);
}
new_cc_state(trans, GSM_CSTATE_ACTIVE);
return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_REJ, &modify);
}
static int gsm48_cc_tx_modify_reject(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *modify = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD REJ");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_MODIFY_REJECT;
/* bearer capability */
gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap);
memcpy(&trans->bearer_cap, &modify->bearer_cap, sizeof(trans->bearer_cap));
/* cause */
gsm48_encode_cause(msg, 1, &modify->cause);
new_cc_state(trans, GSM_CSTATE_ACTIVE);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_tx_notify(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *notify = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC NOT");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_NOTIFY;
/* notify */
gsm48_encode_notify(msg, notify->notify);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_notify(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
// struct tlv_parsed tp;
struct gsm_mncc notify;
memset(&notify, 0, sizeof(struct gsm_mncc));
notify.callref = trans->callref;
// tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len);
if (payload_len >= 1)
gsm48_decode_notify(&notify.notify, gh->data);
return mncc_recvmsg(trans->net, trans, MNCC_NOTIFY_IND, &notify);
}
static int gsm48_cc_tx_userinfo(struct gsm_trans *trans, void *arg)
{
struct gsm_mncc *user = arg;
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USR INFO");
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->msg_type = GSM48_MT_CC_USER_INFO;
/* user-user */
if (user->fields & MNCC_F_USERUSER)
gsm48_encode_useruser(msg, 1, &user->useruser);
/* more data */
if (user->more)
gsm48_encode_more(msg);
return gsm48_conn_sendmsg(msg, trans->conn, trans);
}
static int gsm48_cc_rx_userinfo(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc user;
memset(&user, 0, sizeof(struct gsm_mncc));
user.callref = trans->callref;
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_USER_USER, 0);
/* user-user */
if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) {
user.fields |= MNCC_F_USERUSER;
gsm48_decode_useruser(&user.useruser,
TLVP_VAL(&tp, GSM48_IE_USER_USER)-1);
}
/* more data */
if (TLVP_PRESENT(&tp, GSM48_IE_MORE_DATA))
user.more = 1;
return mncc_recvmsg(trans->net, trans, MNCC_USERINFO_IND, &user);
}
static void mncc_recv_rtp(struct gsm_network *net, uint32_t callref,
int cmd, uint32_t addr, uint16_t port, uint32_t payload_type,
uint32_t payload_msg_type)
{
uint8_t data[sizeof(struct gsm_mncc)];
struct gsm_mncc_rtp *rtp;
memset(&data, 0, sizeof(data));
rtp = (struct gsm_mncc_rtp *) &data[0];
rtp->callref = callref;
rtp->msg_type = cmd;
rtp->ip = addr;
rtp->port = port;
rtp->payload_type = payload_type;
rtp->payload_msg_type = payload_msg_type;
mncc_recvmsg(net, NULL, cmd, (struct gsm_mncc *)data);
}
static void mncc_recv_rtp_sock(struct gsm_network *net, struct gsm_trans *trans, int cmd)
{
int msg_type;
/* FIXME This has to be set to some meaningful value.
* Possible options are:
* GSM_TCHF_FRAME, GSM_TCHF_FRAME_EFR,
* GSM_TCHH_FRAME, GSM_TCH_FRAME_AMR
* (0 if unknown) */
msg_type = GSM_TCHF_FRAME;
uint32_t addr = inet_addr(trans->conn->rtp.local_addr_cn);
uint16_t port = trans->conn->rtp.local_port_cn;
LOGP(DMNCC, LOGL_ERROR, "RTP create for non-existing trans\n");
if (addr == INADDR_NONE) {
LOGP(DMNCC, LOGL_ERROR,
"(subscriber:%s) external MNCC is signalling invalid IP-Address\n",
vlr_subscr_name(trans->vsub));
return;
}
if (port == 0) {
LOGP(DMNCC, LOGL_ERROR,
"(subscriber:%s) external MNCC is signalling invalid Port\n",
vlr_subscr_name(trans->vsub));
return;
}
/* FIXME: This has to be set to some meaningful value,
* before the MSC-Split, this value was pulled from
* lchan->abis_ip.rtp_payload */
uint32_t payload_type = 0;
return mncc_recv_rtp(net, trans->callref, cmd,
addr,
port,
payload_type,
msg_type);
}
static void mncc_recv_rtp_err(struct gsm_network *net, uint32_t callref, int cmd)
{
return mncc_recv_rtp(net, callref, cmd, 0, 0, 0, 0);
}
static int tch_rtp_create(struct gsm_network *net, uint32_t callref)
{
struct gsm_trans *trans;
int rc;
/* Find callref */
trans = trans_find_by_callref(net, callref);
if (!trans) {
LOGP(DMNCC, LOGL_ERROR, "RTP create for non-existing trans\n");
mncc_recv_rtp_err(net, callref, MNCC_RTP_CREATE);
return -EIO;
}
log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub);
if (!trans->conn) {
LOGP(DMNCC, LOGL_NOTICE, "RTP create for trans without conn\n");
mncc_recv_rtp_err(net, callref, MNCC_RTP_CREATE);
return 0;
}
trans->conn->mncc_rtp_bridge = 1;
/* When we call msc_mgcp_call_assignment() we will trigger, depending
* on the RAN type the call assignment on the A or Iu interface.
* msc_mgcp_call_assignment() also takes care about sending the CRCX
* command to the MGCP-GW. The CRCX will return the port number,
* where the PBX (e.g. Asterisk) will send its RTP stream to. We
* have to return this port number back to the MNCC by sending
* it back with the TCH_RTP_CREATE message. To make sure that
* this message is sent AFTER the response to CRCX from the
* MGCP-GW has arrived, we need will instruct msc_mgcp_call_assignment()
* to take care of this by setting trans->tch_rtp_create to true.
* This will make sure that gsm48_tch_rtp_create() (below) is
* called as soon as the local port number has become known. */
trans->tch_rtp_create = true;
/* Assign call (if not done yet) */
if (trans->assignment_done == false) {
rc = msc_mgcp_call_assignment(trans);
trans->assignment_done = true;
}
else
rc = 0;
return rc;
}
/* Trigger TCH_RTP_CREATE acknowledgement */
int gsm48_tch_rtp_create(struct gsm_trans *trans)
{
/* This function is called as soon as the port, on which the
* mgcp-gw expects the incoming RTP stream from the remote
* end (e.g. Asterisk) is known. */
struct gsm_subscriber_connection *conn = trans->conn;
struct gsm_network *network = conn->network;
mncc_recv_rtp_sock(network, trans, MNCC_RTP_CREATE);
return 0;
}
static int tch_rtp_connect(struct gsm_network *net, void *arg)
{
struct gsm_trans *trans;
struct gsm_mncc_rtp *rtp = arg;
struct in_addr addr;
/* Find callref */
trans = trans_find_by_callref(net, rtp->callref);
if (!trans) {
LOGP(DMNCC, LOGL_ERROR, "RTP connect for non-existing trans\n");
mncc_recv_rtp_err(net, rtp->callref, MNCC_RTP_CONNECT);
return -EIO;
}
log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub);
if (!trans->conn) {
LOGP(DMNCC, LOGL_ERROR, "RTP connect for trans without conn\n");
mncc_recv_rtp_err(net, rtp->callref, MNCC_RTP_CONNECT);
return 0;
}
addr.s_addr = osmo_htonl(rtp->ip);
return msc_mgcp_call_complete(trans, rtp->port, inet_ntoa(addr));
}
static struct downstate {
uint32_t states;
int type;
int (*rout) (struct gsm_trans *trans, void *arg);
} downstatelist[] = {
/* mobile originating call establishment */
{SBIT(GSM_CSTATE_INITIATED), /* 5.2.1.2 */
MNCC_CALL_PROC_REQ, gsm48_cc_tx_call_proc_and_assign},
{SBIT(GSM_CSTATE_INITIATED) | SBIT(GSM_CSTATE_MO_CALL_PROC), /* 5.2.1.2 | 5.2.1.5 */
MNCC_ALERT_REQ, gsm48_cc_tx_alerting},
{SBIT(GSM_CSTATE_INITIATED) | SBIT(GSM_CSTATE_MO_CALL_PROC) | SBIT(GSM_CSTATE_CALL_DELIVERED), /* 5.2.1.2 | 5.2.1.6 | 5.2.1.6 */
MNCC_SETUP_RSP, gsm48_cc_tx_connect},
{SBIT(GSM_CSTATE_MO_CALL_PROC), /* 5.2.1.4.2 */
MNCC_PROGRESS_REQ, gsm48_cc_tx_progress},
/* mobile terminating call establishment */
{SBIT(GSM_CSTATE_NULL), /* 5.2.2.1 */
MNCC_SETUP_REQ, gsm48_cc_tx_setup},
{SBIT(GSM_CSTATE_CONNECT_REQUEST),
MNCC_SETUP_COMPL_REQ, gsm48_cc_tx_connect_ack},
/* signalling during call */
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_NOTIFY_REQ, gsm48_cc_tx_notify},
{ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ),
MNCC_FACILITY_REQ, gsm48_cc_tx_facility},
{ALL_STATES,
MNCC_START_DTMF_RSP, gsm48_cc_tx_start_dtmf_ack},
{ALL_STATES,
MNCC_START_DTMF_REJ, gsm48_cc_tx_start_dtmf_rej},
{ALL_STATES,
MNCC_STOP_DTMF_RSP, gsm48_cc_tx_stop_dtmf_ack},
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_HOLD_CNF, gsm48_cc_tx_hold_ack},
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_HOLD_REJ, gsm48_cc_tx_hold_rej},
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_RETRIEVE_CNF, gsm48_cc_tx_retrieve_ack},
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_RETRIEVE_REJ, gsm48_cc_tx_retrieve_rej},
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_MODIFY_REQ, gsm48_cc_tx_modify},
{SBIT(GSM_CSTATE_MO_ORIG_MODIFY),
MNCC_MODIFY_RSP, gsm48_cc_tx_modify_complete},
{SBIT(GSM_CSTATE_MO_ORIG_MODIFY),
MNCC_MODIFY_REJ, gsm48_cc_tx_modify_reject},
{SBIT(GSM_CSTATE_ACTIVE),
MNCC_USERINFO_REQ, gsm48_cc_tx_userinfo},
/* clearing */
{SBIT(GSM_CSTATE_INITIATED),
MNCC_REJ_REQ, gsm48_cc_tx_release_compl},
{ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_DISCONNECT_IND) - SBIT(GSM_CSTATE_RELEASE_REQ) - SBIT(GSM_CSTATE_DISCONNECT_REQ), /* 5.4.4 */
MNCC_DISC_REQ, gsm48_cc_tx_disconnect},
{ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), /* 5.4.3.2 */
MNCC_REL_REQ, gsm48_cc_tx_release},
};
#define DOWNSLLEN \
(sizeof(downstatelist) / sizeof(struct downstate))
int mncc_tx_to_cc(struct gsm_network *net, int msg_type, void *arg)
{
int i, rc = 0;
struct gsm_trans *trans = NULL, *transt;
struct gsm_subscriber_connection *conn = NULL;
struct gsm_mncc *data = arg, rel;
DEBUGP(DMNCC, "receive message %s\n", get_mncc_name(msg_type));
/* handle special messages */
switch(msg_type) {
case MNCC_BRIDGE:
rc = tch_bridge(net, arg);
if (rc < 0)
disconnect_bridge(net, arg, -rc);
return rc;
case MNCC_RTP_CREATE:
return tch_rtp_create(net, data->callref);
case MNCC_RTP_CONNECT:
return tch_rtp_connect(net, arg);
case MNCC_RTP_FREE:
/* unused right now */
return -EIO;
case MNCC_FRAME_DROP:
case MNCC_FRAME_RECV:
case GSM_TCHF_FRAME:
case GSM_TCHF_FRAME_EFR:
case GSM_TCHH_FRAME:
case GSM_TCH_FRAME_AMR:
LOGP(DMNCC, LOGL_ERROR, "RTP streams must be handled externally; %s not supported.\n",
get_mncc_name(msg_type));
return -ENOTSUP;
}
memset(&rel, 0, sizeof(struct gsm_mncc));
rel.callref = data->callref;
/* Find callref */
trans = trans_find_by_callref(net, data->callref);
/* Callref unknown */
if (!trans) {
struct vlr_subscr *vsub;
if (msg_type != MNCC_SETUP_REQ) {
DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) "
"Received '%s' from MNCC with "
"unknown callref %d\n", data->called.number,
get_mncc_name(msg_type), data->callref);
/* Invalid call reference */
return mncc_release_ind(net, NULL, data->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_INVAL_TRANS_ID);
}
if (!data->called.number[0] && !data->imsi[0]) {
DEBUGP(DCC, "(bts - trx - ts - ti) "
"Received '%s' from MNCC with "
"no number or IMSI\n", get_mncc_name(msg_type));
/* Invalid number */
return mncc_release_ind(net, NULL, data->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_INV_NR_FORMAT);
}
/* New transaction due to setup, find subscriber */
if (data->called.number[0])
vsub = vlr_subscr_find_by_msisdn(net->vlr,
data->called.number);
else
vsub = vlr_subscr_find_by_imsi(net->vlr, data->imsi);
/* update the subscriber we deal with */
log_set_context(LOG_CTX_VLR_SUBSCR, vsub);
/* If subscriber is not found */
if (!vsub) {
DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) "
"Received '%s' from MNCC with "
"unknown subscriber %s\n", data->called.number,
get_mncc_name(msg_type), data->called.number);
/* Unknown subscriber */
return mncc_release_ind(net, NULL, data->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_UNASSIGNED_NR);
}
/* If subscriber is not "attached" */
if (!vsub->lac) {
DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) "
"Received '%s' from MNCC with "
"detached subscriber %s\n", data->called.number,
get_mncc_name(msg_type), vlr_subscr_name(vsub));
vlr_subscr_put(vsub);
/* Temporarily out of order */
return mncc_release_ind(net, NULL, data->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_DEST_OOO);
}
/* Create transaction */
trans = trans_alloc(net, vsub, GSM48_PDISC_CC, 0xff, data->callref);
if (!trans) {
DEBUGP(DCC, "No memory for trans.\n");
vlr_subscr_put(vsub);
/* Ressource unavailable */
mncc_release_ind(net, NULL, data->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
return -ENOMEM;
}
/* Find conn */
conn = connection_for_subscr(vsub);
/* If subscriber has no conn */
if (!conn) {
/* find transaction with this subscriber already paging */
llist_for_each_entry(transt, &net->trans_list, entry) {
/* Transaction of our conn? */
if (transt == trans ||
transt->vsub != vsub)
continue;
DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) "
"Received '%s' from MNCC with "
"unallocated channel, paging already "
"started for lac %d.\n",
data->called.number,
get_mncc_name(msg_type), vsub->lac);
vlr_subscr_put(vsub);
trans_free(trans);
return 0;
}
/* store setup information until paging succeeds */
memcpy(&trans->cc.msg, data, sizeof(struct gsm_mncc));
/* Request a channel */
trans->paging_request = subscr_request_conn(
vsub,
setup_trig_pag_evt,
trans,
"MNCC: establish call");
if (!trans->paging_request) {
LOGP(DCC, LOGL_ERROR, "Failed to allocate paging token.\n");
vlr_subscr_put(vsub);
trans_free(trans);
return 0;
}
vlr_subscr_put(vsub);
return 0;
}
/* Assign conn */
trans->conn = msc_subscr_conn_get(conn, MSC_CONN_USE_TRANS_CC);
trans->dlci = 0x00; /* SAPI=0, not SACCH */
vlr_subscr_put(vsub);
} else {
/* update the subscriber we deal with */
log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub);
}
if (trans->conn)
conn = trans->conn;
/* if paging did not respond yet */
if (!conn) {
DEBUGP(DCC, "(sub %s) "
"Received '%s' from MNCC in paging state\n",
vlr_subscr_msisdn_or_name(trans->vsub),
get_mncc_name(msg_type));
mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_NORM_CALL_CLEAR);
if (msg_type == MNCC_REL_REQ)
rc = mncc_recvmsg(net, trans, MNCC_REL_CNF, &rel);
else
rc = mncc_recvmsg(net, trans, MNCC_REL_IND, &rel);
trans->callref = 0;
trans_free(trans);
return rc;
} else {
DEBUGP(DCC, "(ti %02x sub %s) "
"Received '%s' from MNCC in state %d (%s)\n",
trans->transaction_id,
vlr_subscr_msisdn_or_name(trans->conn->vsub),
get_mncc_name(msg_type), trans->cc.state,
gsm48_cc_state_name(trans->cc.state));
}
/* Find function for current state and message */
for (i = 0; i < DOWNSLLEN; i++)
if ((msg_type == downstatelist[i].type)
&& ((1 << trans->cc.state) & downstatelist[i].states))
break;
if (i == DOWNSLLEN) {
DEBUGP(DCC, "Message unhandled at this state.\n");
return 0;
}
rc = downstatelist[i].rout(trans, arg);
return rc;
}
static struct datastate {
uint32_t states;
int type;
int (*rout) (struct gsm_trans *trans, struct msgb *msg);
} datastatelist[] = {
/* mobile originating call establishment */
{SBIT(GSM_CSTATE_NULL), /* 5.2.1.2 */
GSM48_MT_CC_SETUP, gsm48_cc_rx_setup},
{SBIT(GSM_CSTATE_NULL), /* 5.2.1.2 */
GSM48_MT_CC_EMERG_SETUP, gsm48_cc_rx_setup},
{SBIT(GSM_CSTATE_CONNECT_IND), /* 5.2.1.2 */
GSM48_MT_CC_CONNECT_ACK, gsm48_cc_rx_connect_ack},
/* mobile terminating call establishment */
{SBIT(GSM_CSTATE_CALL_PRESENT), /* 5.2.2.3.2 */
GSM48_MT_CC_CALL_CONF, gsm48_cc_rx_call_conf},
{SBIT(GSM_CSTATE_CALL_PRESENT) | SBIT(GSM_CSTATE_MO_TERM_CALL_CONF), /* ???? | 5.2.2.3.2 */
GSM48_MT_CC_ALERTING, gsm48_cc_rx_alerting},
{SBIT(GSM_CSTATE_CALL_PRESENT) | SBIT(GSM_CSTATE_MO_TERM_CALL_CONF) | SBIT(GSM_CSTATE_CALL_RECEIVED), /* (5.2.2.6) | 5.2.2.6 | 5.2.2.6 */
GSM48_MT_CC_CONNECT, gsm48_cc_rx_connect},
/* signalling during call */
{ALL_STATES - SBIT(GSM_CSTATE_NULL),
GSM48_MT_CC_FACILITY, gsm48_cc_rx_facility},
{SBIT(GSM_CSTATE_ACTIVE),
GSM48_MT_CC_NOTIFY, gsm48_cc_rx_notify},
{ALL_STATES,
GSM48_MT_CC_START_DTMF, gsm48_cc_rx_start_dtmf},
{ALL_STATES,
GSM48_MT_CC_STOP_DTMF, gsm48_cc_rx_stop_dtmf},
{ALL_STATES,
GSM48_MT_CC_STATUS_ENQ, gsm48_cc_rx_status_enq},
{SBIT(GSM_CSTATE_ACTIVE),
GSM48_MT_CC_HOLD, gsm48_cc_rx_hold},
{SBIT(GSM_CSTATE_ACTIVE),
GSM48_MT_CC_RETR, gsm48_cc_rx_retrieve},
{SBIT(GSM_CSTATE_ACTIVE),
GSM48_MT_CC_MODIFY, gsm48_cc_rx_modify},
{SBIT(GSM_CSTATE_MO_TERM_MODIFY),
GSM48_MT_CC_MODIFY_COMPL, gsm48_cc_rx_modify_complete},
{SBIT(GSM_CSTATE_MO_TERM_MODIFY),
GSM48_MT_CC_MODIFY_REJECT, gsm48_cc_rx_modify_reject},
{SBIT(GSM_CSTATE_ACTIVE),
GSM48_MT_CC_USER_INFO, gsm48_cc_rx_userinfo},
/* clearing */
{ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), /* 5.4.3.2 */
GSM48_MT_CC_DISCONNECT, gsm48_cc_rx_disconnect},
{ALL_STATES - SBIT(GSM_CSTATE_NULL), /* 5.4.4.1.2.2 */
GSM48_MT_CC_RELEASE, gsm48_cc_rx_release},
{ALL_STATES, /* 5.4.3.4 */
GSM48_MT_CC_RELEASE_COMPL, gsm48_cc_rx_release_compl},
};
#define DATASLLEN \
(sizeof(datastatelist) / sizeof(struct datastate))
static int gsm0408_rcv_cc(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t msg_type = gsm48_hdr_msg_type(gh);
uint8_t transaction_id = gsm48_hdr_trans_id_flip_ti(gh);
struct gsm_trans *trans = NULL;
int i, rc = 0;
if (msg_type & 0x80) {
DEBUGP(DCC, "MSG 0x%2x not defined for PD error\n", msg_type);
return -EINVAL;
}
if (!conn->vsub) {
LOGP(DCC, LOGL_ERROR, "Invalid conn: no subscriber\n");
return -EINVAL;
}
/* Find transaction */
trans = trans_find_by_id(conn, GSM48_PDISC_CC, transaction_id);
#if BEFORE_MSCSPLIT
/* Re-enable this log output once we can obtain this information via
* A-interface, see OS#2391. */
DEBUGP(DCC, "(bts %d trx %d ts %d ti %x sub %s) "
"Received '%s' from MS in state %d (%s)\n",
conn->bts->nr, conn->lchan->ts->trx->nr, conn->lchan->ts->nr,
transaction_id, vlr_subscr_msisdn_or_name(conn->vsub),
gsm48_cc_msg_name(msg_type), trans?(trans->cc.state):0,
gsm48_cc_state_name(trans?(trans->cc.state):0));
#endif
/* Create transaction */
if (!trans) {
DEBUGP(DCC, "Unknown transaction ID %x, "
"creating new trans.\n", transaction_id);
/* Create transaction */
trans = trans_alloc(conn->network, conn->vsub,
GSM48_PDISC_CC,
transaction_id, new_callref++);
if (!trans) {
DEBUGP(DCC, "No memory for trans.\n");
rc = gsm48_tx_simple(conn,
GSM48_PDISC_CC | (transaction_id << 4),
GSM48_MT_CC_RELEASE_COMPL);
return -ENOMEM;
}
/* Assign transaction */
trans->conn = msc_subscr_conn_get(conn, MSC_CONN_USE_TRANS_CC);
trans->dlci = OMSC_LINKID_CB(msg); /* DLCI as received from BSC */
cm_service_request_concludes(conn, msg);
}
/* find function for current state and message */
for (i = 0; i < DATASLLEN; i++)
if ((msg_type == datastatelist[i].type)
&& ((1 << trans->cc.state) & datastatelist[i].states))
break;
if (i == DATASLLEN) {
DEBUGP(DCC, "Message unhandled at this state.\n");
return 0;
}
assert(trans->vsub);
rc = datastatelist[i].rout(trans, msg);
msc_subscr_conn_communicating(conn);
return rc;
}
static bool msg_is_initially_permitted(const struct gsm48_hdr *hdr)
{
uint8_t pdisc = gsm48_hdr_pdisc(hdr);
uint8_t msg_type = gsm48_hdr_msg_type(hdr);
switch (pdisc) {
case GSM48_PDISC_MM:
switch (msg_type) {
case GSM48_MT_MM_LOC_UPD_REQUEST:
case GSM48_MT_MM_CM_SERV_REQ:
case GSM48_MT_MM_CM_REEST_REQ:
case GSM48_MT_MM_AUTH_RESP:
case GSM48_MT_MM_AUTH_FAIL:
case GSM48_MT_MM_ID_RESP:
case GSM48_MT_MM_TMSI_REALL_COMPL:
case GSM48_MT_MM_IMSI_DETACH_IND:
return true;
default:
break;
}
break;
case GSM48_PDISC_RR:
switch (msg_type) {
case GSM48_MT_RR_CIPH_M_COMPL:
case GSM48_MT_RR_PAG_RESP:
return true;
default:
break;
}
break;
default:
break;
}
return false;
}
void cm_service_request_concludes(struct gsm_subscriber_connection *conn,
struct msgb *msg)
{
/* If a CM Service Request was received before, this is the request the
* conn was opened for. No need to wait for further messages. */
if (!conn->received_cm_service_request)
return;
if (log_check_level(DMM, LOGL_DEBUG)) {
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t pdisc = gsm48_hdr_pdisc(gh);
uint8_t msg_type = gsm48_hdr_msg_type(gh);
DEBUGP(DMM, "%s: rx msg %s:"
" received_cm_service_request changes to false\n",
vlr_subscr_name(conn->vsub),
gsm48_pdisc_msgtype_name(pdisc, msg_type));
}
conn->received_cm_service_request = false;
msc_subscr_conn_put(conn, MSC_CONN_USE_CM_SERVICE);
}
/* TS 24.007 11.2.3.2.3 Message Type Octet / Duplicate Detection */
int gsm0407_pdisc_ctr_bin(uint8_t pdisc)
{
switch (pdisc) {
case GSM48_PDISC_MM:
case GSM48_PDISC_CC:
case GSM48_PDISC_NC_SS:
return 0;
case GSM48_PDISC_GROUP_CC:
return 1;
case GSM48_PDISC_BCAST_CC:
return 2;
case GSM48_PDISC_LOC:
return 3;
default:
return -1;
}
}
/* extract the N(SD) and return the modulo value for a R98 message */
static uint8_t gsm0407_determine_nsd_ret_modulo_r99(uint8_t pdisc, uint8_t msg_type, uint8_t *n_sd)
{
switch (pdisc) {
case GSM48_PDISC_MM:
case GSM48_PDISC_CC:
case GSM48_PDISC_NC_SS:
*n_sd = (msg_type >> 6) & 0x3;
return 4;
case GSM48_PDISC_GROUP_CC:
case GSM48_PDISC_BCAST_CC:
case GSM48_PDISC_LOC:
*n_sd = (msg_type >> 6) & 0x1;
return 2;
default:
/* no sequence number, we cannot detect dups */
return 0;
}
}
/* extract the N(SD) and return the modulo value for a R99 message */
static uint8_t gsm0407_determine_nsd_ret_modulo_r98(uint8_t pdisc, uint8_t msg_type, uint8_t *n_sd)
{
switch (pdisc) {
case GSM48_PDISC_MM:
case GSM48_PDISC_CC:
case GSM48_PDISC_NC_SS:
case GSM48_PDISC_GROUP_CC:
case GSM48_PDISC_BCAST_CC:
case GSM48_PDISC_LOC:
*n_sd = (msg_type >> 6) & 0x1;
return 2;
default:
/* no sequence number, we cannot detect dups */
return 0;
}
}
/* TS 24.007 11.2.3.2 Message Type Octet / Duplicate Detection */
static bool gsm0407_is_duplicate(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh;
uint8_t pdisc;
uint8_t n_sd, modulo, bin;
gh = msgb_l3(msg);
pdisc = gsm48_hdr_pdisc(gh);
if (conn->classmark.classmark1_set && conn->classmark.classmark1.rev_lev < 2) {
modulo = gsm0407_determine_nsd_ret_modulo_r98(pdisc, gh->msg_type, &n_sd);
} else { /* R99 */
modulo = gsm0407_determine_nsd_ret_modulo_r99(pdisc, gh->msg_type, &n_sd);
}
if (modulo == 0)
return false;
bin = gsm0407_pdisc_ctr_bin(pdisc);
if (bin < 0)
return false;
OSMO_ASSERT(bin < ARRAY_SIZE(conn->n_sd_next));
if (n_sd != conn->n_sd_next[bin]) {
/* not what we expected: duplicate */
return true;
} else {
/* as expected: no dup; update expected counter for next message */
conn->n_sd_next[bin] = (n_sd + 1) % modulo;
return false;
}
}
/* Main entry point for GSM 04.08/44.008 Layer 3 data (e.g. from the BSC). */
int gsm0408_dispatch(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh;
uint8_t pdisc;
int rc = 0;
OSMO_ASSERT(msg->l3h);
OSMO_ASSERT(conn);
OSMO_ASSERT(msg);
gh = msgb_l3(msg);
pdisc = gsm48_hdr_pdisc(gh);
if (gsm0407_is_duplicate(conn, msg)) {
LOGP(DRLL, LOGL_NOTICE, "%s: Discarding duplicate L3 message\n",
(conn && conn->vsub) ? vlr_subscr_name(conn->vsub) : "UNKNOWN");
return 0;
}
LOGP(DRLL, LOGL_DEBUG, "Dispatching 04.08 message %s (0x%x:0x%x)\n",
gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh)),
pdisc, gsm48_hdr_msg_type(gh));
if (!msc_subscr_conn_is_accepted(conn)
&& !msg_is_initially_permitted(gh)) {
LOGP(DRLL, LOGL_ERROR,
"subscr %s: Message not permitted for initial conn: %s\n",
vlr_subscr_name(conn->vsub),
gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh)));
return -EACCES;
}
if (conn->vsub && conn->vsub->cs.attached_via_ran != conn->via_ran) {
LOGP(DMM, LOGL_ERROR,
"%s: Illegal situation: RAN type mismatch:"
" attached via %s, received message via %s\n",
vlr_subscr_name(conn->vsub),
ran_type_name(conn->vsub->cs.attached_via_ran),
ran_type_name(conn->via_ran));
return -EACCES;
}
#if 0
if (silent_call_reroute(conn, msg))
return silent_call_rx(conn, msg);
#endif
switch (pdisc) {
case GSM48_PDISC_CC:
rc = gsm0408_rcv_cc(conn, msg);
break;
case GSM48_PDISC_MM:
rc = gsm0408_rcv_mm(conn, msg);
break;
case GSM48_PDISC_RR:
rc = gsm0408_rcv_rr(conn, msg);
break;
case GSM48_PDISC_SMS:
rc = gsm0411_rcv_sms(conn, msg);
break;
case GSM48_PDISC_MM_GPRS:
case GSM48_PDISC_SM_GPRS:
LOGP(DRLL, LOGL_NOTICE, "Unimplemented "
"GSM 04.08 discriminator 0x%02x\n", pdisc);
rc = -ENOTSUP;
break;
case GSM48_PDISC_NC_SS:
rc = handle_rcv_ussd(conn, msg);
break;
case GSM48_PDISC_TEST:
rc = gsm0414_rcv_test(conn, msg);
break;
default:
LOGP(DRLL, LOGL_NOTICE, "Unknown "
"GSM 04.08 discriminator 0x%02x\n", pdisc);
rc = -EINVAL;
break;
}
return rc;
}
/***********************************************************************
* VLR integration
***********************************************************************/
/* VLR asks us to send an authentication request */
static int msc_vlr_tx_auth_req(void *msc_conn_ref, struct gsm_auth_tuple *at,
bool send_autn)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return gsm48_tx_mm_auth_req(conn, at->vec.rand,
send_autn? at->vec.autn : NULL,
at->key_seq);
}
/* VLR asks us to send an authentication reject */
static int msc_vlr_tx_auth_rej(void *msc_conn_ref)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return gsm48_tx_mm_auth_rej(conn);
}
/* VLR asks us to transmit an Identity Request of given type */
static int msc_vlr_tx_id_req(void *msc_conn_ref, uint8_t mi_type)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return mm_tx_identity_req(conn, mi_type);
}
/* VLR asks us to transmit a Location Update Accept */
static int msc_vlr_tx_lu_acc(void *msc_conn_ref, uint32_t send_tmsi)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return gsm0408_loc_upd_acc(conn, send_tmsi);
}
/* VLR asks us to transmit a Location Update Reject */
static int msc_vlr_tx_lu_rej(void *msc_conn_ref, enum gsm48_reject_value cause)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return gsm0408_loc_upd_rej(conn, cause);
}
/* VLR asks us to transmit a CM Service Accept */
static int msc_vlr_tx_cm_serv_acc(void *msc_conn_ref)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return msc_gsm48_tx_mm_serv_ack(conn);
}
static int msc_vlr_tx_common_id(void *msc_conn_ref)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
return msc_tx_common_id(conn);
}
/* VLR asks us to transmit MM info. */
static int msc_vlr_tx_mm_info(void *msc_conn_ref)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
if (!conn->network->send_mm_info)
return 0;
return gsm48_tx_mm_info(conn);
}
/* VLR asks us to transmit a CM Service Reject */
static int msc_vlr_tx_cm_serv_rej(void *msc_conn_ref, enum gsm48_reject_value cause)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
int rc;
rc = msc_gsm48_tx_mm_serv_rej(conn, cause);
if (conn->received_cm_service_request) {
conn->received_cm_service_request = false;
msc_subscr_conn_put(conn, MSC_CONN_USE_CM_SERVICE);
}
return rc;
}
/* For msc_vlr_set_ciph_mode() */
osmo_static_assert(sizeof(((struct gsm0808_encrypt_info*)0)->key) >= sizeof(((struct osmo_auth_vector*)0)->kc),
gsm0808_encrypt_info_key_fits_osmo_auth_vec_kc);
/* VLR asks us to start using ciphering.
* (Keep non-static to allow regression testing on this function.) */
int msc_vlr_set_ciph_mode(void *msc_conn_ref,
bool umts_aka,
bool retrieve_imeisv)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
struct vlr_subscr *vsub;
struct gsm_auth_tuple *tuple;
if (!conn || !conn->vsub) {
LOGP(DMM, LOGL_ERROR, "Cannot send Ciphering Mode Command to"
" NULL conn/subscriber");
return -EINVAL;
}
vsub = conn->vsub;
tuple = vsub->last_tuple;
if (!tuple) {
LOGP(DMM, LOGL_ERROR, "subscr %s: Cannot send Ciphering Mode"
" Command: no auth tuple available\n",
vlr_subscr_name(vsub));
return -EINVAL;
}
switch (conn->via_ran) {
case RAN_GERAN_A:
DEBUGP(DMM, "-> CIPHER MODE COMMAND %s\n",
vlr_subscr_name(conn->vsub));
{
struct gsm_network *net = conn->network;
struct gsm0808_encrypt_info ei;
int i, j = 0;
for (i = 0; i < 8; i++) {
if (net->a5_encryption_mask & (1 << i) &&
classmark_supports_a5(&conn->classmark, i))
ei.perm_algo[j++] = vlr_ciph_to_gsm0808_alg_id(i);
}
ei.perm_algo_len = j;
if (ei.perm_algo_len == 0) {
LOGP(DMM, LOGL_ERROR, "%s: cannot start ciphering, no intersection "
"between MSC-configured and MS-supported A5 algorithms\n",
vlr_subscr_name(conn->vsub));
return -ENOTSUP;
}
/* In case of UMTS AKA, the Kc for ciphering must be derived from the 3G auth
* tokens. tuple->vec.kc was calculated from the GSM algorithm and is not
* necessarily a match for the UMTS AKA tokens. */
if (umts_aka)
osmo_auth_c3(ei.key, tuple->vec.ck, tuple->vec.ik);
else
memcpy(ei.key, tuple->vec.kc, sizeof(tuple->vec.kc));
ei.key_len = sizeof(tuple->vec.kc);
return a_iface_tx_cipher_mode(conn, &ei, retrieve_imeisv);
}
case RAN_UTRAN_IU:
#ifdef BUILD_IU
DEBUGP(DMM, "-> SECURITY MODE CONTROL %s\n",
vlr_subscr_name(conn->vsub));
return ranap_iu_tx_sec_mode_cmd(conn->iu.ue_ctx, &tuple->vec, 0, 1);
#else
LOGP(DMM, LOGL_ERROR, "Cannot send Security Mode Control over RAN_UTRAN_IU,"
" built without Iu support\n");
return -ENOTSUP;
#endif
default:
break;
}
LOGP(DMM, LOGL_ERROR,
"%s: cannot start ciphering, unknown RAN type %d\n",
vlr_subscr_name(conn->vsub), conn->via_ran);
return -ENOTSUP;
}
void msc_rx_sec_mode_compl(struct gsm_subscriber_connection *conn)
{
struct vlr_ciph_result vlr_res = {};
if (!conn || !conn->vsub) {
LOGP(DMM, LOGL_ERROR,
"Rx Security Mode Complete for invalid conn\n");
return;
}
DEBUGP(DMM, "<- SECURITY MODE COMPLETE %s\n",
vlr_subscr_name(conn->vsub));
vlr_res.cause = VLR_CIPH_COMPL;
vlr_subscr_rx_ciph_res(conn->vsub, &vlr_res);
}
/* VLR informs us that the subscriber data has somehow been modified */
static void msc_vlr_subscr_update(struct vlr_subscr *subscr)
{
LOGVSUBP(LOGL_NOTICE, subscr, "VLR: update for IMSI=%s (MSISDN=%s, used=%d)\n",
subscr->imsi, subscr->msisdn, subscr->use_count);
}
/* VLR informs us that the subscriber has been associated with a conn */
static void msc_vlr_subscr_assoc(void *msc_conn_ref,
struct vlr_subscr *vsub)
{
struct gsm_subscriber_connection *conn = msc_conn_ref;
OSMO_ASSERT(vsub);
OSMO_ASSERT(!conn->vsub);
conn->vsub = vlr_subscr_get(vsub);
OSMO_ASSERT(conn->vsub);
conn->vsub->cs.attached_via_ran = conn->via_ran;
}
/* operations that we need to implement for libvlr */
static const struct vlr_ops msc_vlr_ops = {
.tx_auth_req = msc_vlr_tx_auth_req,
.tx_auth_rej = msc_vlr_tx_auth_rej,
.tx_id_req = msc_vlr_tx_id_req,
.tx_lu_acc = msc_vlr_tx_lu_acc,
.tx_lu_rej = msc_vlr_tx_lu_rej,
.tx_cm_serv_acc = msc_vlr_tx_cm_serv_acc,
.tx_cm_serv_rej = msc_vlr_tx_cm_serv_rej,
.set_ciph_mode = msc_vlr_set_ciph_mode,
.tx_common_id = msc_vlr_tx_common_id,
.tx_mm_info = msc_vlr_tx_mm_info,
.subscr_update = msc_vlr_subscr_update,
.subscr_assoc = msc_vlr_subscr_assoc,
};
/* Allocate net->vlr so that the VTY may configure the VLR's data structures */
int msc_vlr_alloc(struct gsm_network *net)
{
net->vlr = vlr_alloc(net, &msc_vlr_ops);
if (!net->vlr)
return -ENOMEM;
net->vlr->user_ctx = net;
return 0;
}
/* Launch the VLR, i.e. its GSUP connection */
int msc_vlr_start(struct gsm_network *net)
{
OSMO_ASSERT(net->vlr);
return vlr_start("MSC", net->vlr, net->gsup_server_addr_str,
net->gsup_server_port);
}
struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value)
{
struct msgb *msg;
struct gsm48_hdr *gh;
msg = gsm48_msgb_alloc_name("GSM 04.08 SERV REJ");
if (!msg)
return NULL;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
gh->data[0] = value;
return msg;
}
struct msgb *gsm48_create_loc_upd_rej(uint8_t cause)
{
struct gsm48_hdr *gh;
struct msgb *msg;
msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD REJ");
if (!msg)
return NULL;
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;
return msg;
}
int gsm48_extract_mi(uint8_t *classmark2_lv, int length, char *mi_string, uint8_t *mi_type)
{
/* Check the size for the classmark */
if (length < 1 + *classmark2_lv)
return -1;
uint8_t *mi_lv = classmark2_lv + *classmark2_lv + 1;
if (length < 2 + *classmark2_lv + mi_lv[0])
return -2;
*mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
return gsm48_mi_to_string(mi_string, GSM48_MI_SIZE, mi_lv+1, *mi_lv);
}
int gsm48_paging_extract_mi(struct gsm48_pag_resp *resp, int length,
char *mi_string, uint8_t *mi_type)
{
static const uint32_t classmark_offset =
offsetof(struct gsm48_pag_resp, classmark2);
uint8_t *classmark2_lv = (uint8_t *) &resp->classmark2;
return gsm48_extract_mi(classmark2_lv, length - classmark_offset,
mi_string, mi_type);
}
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