139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* GSM 04.07 Transaction handling */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdint.h>
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#include <osmocore/talloc.h>
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#include <osmocore/timer.h>
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#include <osmocore/msgb.h>
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#include <osmocom/osmocom_data.h>
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#include <osmocom/mncc.h>
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#include <osmocom/transaction.h>
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#include <osmocom/logging.h>
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extern void *l23_ctx;
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void _gsm48_cc_trans_free(struct gsm_trans *trans);
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struct gsm_trans *trans_find_by_id(struct osmocom_ms *ms,
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uint8_t proto, uint8_t trans_id)
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{
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struct gsm_trans *trans;
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llist_for_each_entry(trans, &ms->trans_list, entry) {
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if (trans->protocol == proto &&
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trans->transaction_id == trans_id)
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return trans;
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}
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return NULL;
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}
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struct gsm_trans *trans_find_by_callref(struct osmocom_ms *ms,
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uint32_t callref)
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{
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struct gsm_trans *trans;
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llist_for_each_entry(trans, &ms->trans_list, entry) {
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if (trans->callref == callref)
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return trans;
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}
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return NULL;
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}
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struct gsm_trans *trans_alloc(struct osmocom_ms *ms,
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uint8_t protocol, uint8_t trans_id,
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uint32_t callref)
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{
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struct gsm_trans *trans;
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DEBUGP(DCC, "ms %s\n", ms->name);
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trans = talloc_zero(l23_ctx, struct gsm_trans);
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if (!trans)
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return NULL;
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trans->ms = ms;
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trans->protocol = protocol;
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trans->transaction_id = trans_id;
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trans->callref = callref;
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llist_add_tail(&trans->entry, &ms->trans_list);
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return trans;
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}
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void trans_free(struct gsm_trans *trans)
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{
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switch (trans->protocol) {
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case GSM48_PDISC_CC:
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_gsm48_cc_trans_free(trans);
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break;
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#if 0
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case GSM48_PDISC_SS:
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_gsm411_ss_trans_free(trans);
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break;
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case GSM48_PDISC_SMS:
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_gsm411_sms_trans_free(trans);
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break;
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#endif
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}
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llist_del(&trans->entry);
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talloc_free(trans);
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}
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/* allocate an unused transaction ID
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* in the given protocol using the ti_flag specified */
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int trans_assign_trans_id(struct osmocom_ms *ms,
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uint8_t protocol, uint8_t ti_flag)
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{
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struct gsm_trans *trans;
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unsigned int used_tid_bitmask = 0;
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int i, j, h;
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if (ti_flag)
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ti_flag = 0x8;
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/* generate bitmask of already-used TIDs for this (proto) */
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llist_for_each_entry(trans, &ms->trans_list, entry) {
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if (trans->protocol != protocol ||
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trans->transaction_id == 0xff)
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continue;
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used_tid_bitmask |= (1 << trans->transaction_id);
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}
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/* find a new one, trying to go in a 'circular' pattern */
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for (h = 6; h > 0; h--)
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if (used_tid_bitmask & (1 << (h | ti_flag)))
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break;
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for (i = 0; i < 7; i++) {
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j = ((h + i) % 7) | ti_flag;
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if ((used_tid_bitmask & (1 << j)) == 0)
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return j;
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}
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return -1;
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}
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