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/* GSM 04.07 Transaction handling */
/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/msgb.h>
#include <osmocom/bb/common/osmocom_data.h>
#include <osmocom/bb/common/logging.h>
#include <osmocom/bb/mobile/mncc.h>
#include <osmocom/bb/mobile/transaction.h>
extern void *l23_ctx;
void _gsm48_cc_trans_free(struct gsm_trans *trans);
void _gsm480_ss_trans_free(struct gsm_trans *trans);
void _gsm411_sms_trans_free(struct gsm_trans *trans);
struct gsm_trans *trans_find_by_id(struct osmocom_ms *ms,
uint8_t proto, uint8_t trans_id)
{
struct gsm_trans *trans;
llist_for_each_entry(trans, &ms->trans_list, entry) {
if (trans->protocol == proto &&
trans->transaction_id == trans_id)
return trans;
}
return NULL;
}
struct gsm_trans *trans_find_by_callref(struct osmocom_ms *ms,
uint32_t callref)
{
struct gsm_trans *trans;
llist_for_each_entry(trans, &ms->trans_list, entry) {
if (trans->callref == callref)
return trans;
}
return NULL;
}
struct gsm_trans *trans_alloc(struct osmocom_ms *ms,
uint8_t protocol, uint8_t trans_id,
uint32_t callref)
{
struct gsm_trans *trans;
trans = talloc_zero(l23_ctx, struct gsm_trans);
if (!trans)
return NULL;
DEBUGP(DCC, "ms %s allocates transaction (proto %d trans_id %d "
"callref %x mem %p)\n", ms->name, protocol, trans_id, callref,
trans);
trans->ms = ms;
trans->protocol = protocol;
trans->transaction_id = trans_id;
trans->callref = callref;
llist_add_tail(&trans->entry, &ms->trans_list);
return trans;
}
void trans_free(struct gsm_trans *trans)
{
switch (trans->protocol) {
case GSM48_PDISC_CC:
_gsm48_cc_trans_free(trans);
break;
case GSM48_PDISC_NC_SS:
_gsm480_ss_trans_free(trans);
break;
case GSM48_PDISC_SMS:
_gsm411_sms_trans_free(trans);
break;
}
DEBUGP(DCC, "ms %s frees transaction (mem %p)\n", trans->ms->name,
trans);
llist_del(&trans->entry);
talloc_free(trans);
}
/* allocate an unused transaction ID
* in the given protocol using the ti_flag specified */
int trans_assign_trans_id(struct osmocom_ms *ms,
uint8_t protocol, uint8_t ti_flag)
{
struct gsm_trans *trans;
unsigned int used_tid_bitmask = 0;
int i, j, h;
if (ti_flag)
ti_flag = 0x8;
/* generate bitmask of already-used TIDs for this (proto) */
llist_for_each_entry(trans, &ms->trans_list, entry) {
if (trans->protocol != protocol ||
trans->transaction_id == 0xff)
continue;
used_tid_bitmask |= (1 << trans->transaction_id);
}
/* find a new one, trying to go in a 'circular' pattern */
for (h = 6; h > 0; h--)
if (used_tid_bitmask & (1 << (h | ti_flag)))
break;
for (i = 0; i < 7; i++) {
j = ((h + i) % 7) | ti_flag;
if ((used_tid_bitmask & (1 << j)) == 0)
return j;
}
return -1;
}
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