| /* 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 <openbsc/transaction.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/mncc.h> |
| #include <openbsc/debug.h> |
| #include <osmocore/talloc.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/mncc.h> |
| #include <openbsc/paging.h> |
| |
| void *tall_trans_ctx; |
| |
| void _gsm48_cc_trans_free(struct gsm_trans *trans); |
| |
| struct gsm_trans *trans_find_by_id(struct gsm_subscriber *subscr, |
| u_int8_t proto, u_int8_t trans_id) |
| { |
| struct gsm_trans *trans; |
| struct gsm_network *net = subscr->net; |
| |
| llist_for_each_entry(trans, &net->trans_list, entry) { |
| if (trans->subscr == subscr && |
| trans->protocol == proto && |
| trans->transaction_id == trans_id) |
| return trans; |
| } |
| return NULL; |
| } |
| |
| struct gsm_trans *trans_find_by_callref(struct gsm_network *net, |
| u_int32_t callref) |
| { |
| struct gsm_trans *trans; |
| |
| llist_for_each_entry(trans, &net->trans_list, entry) { |
| if (trans->callref == callref) |
| return trans; |
| } |
| return NULL; |
| } |
| |
| struct gsm_trans *trans_alloc(struct gsm_subscriber *subscr, |
| u_int8_t protocol, u_int8_t trans_id, |
| u_int32_t callref) |
| { |
| struct gsm_trans *trans; |
| |
| DEBUGP(DCC, "subscr=%p, subscr->net=%p\n", subscr, subscr->net); |
| |
| trans = talloc_zero(tall_trans_ctx, struct gsm_trans); |
| if (!trans) |
| return NULL; |
| |
| trans->subscr = subscr; |
| subscr_get(trans->subscr); |
| |
| trans->protocol = protocol; |
| trans->transaction_id = trans_id; |
| trans->callref = callref; |
| |
| llist_add_tail(&trans->entry, &subscr->net->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_SMS: |
| _gsm411_sms_trans_free(trans); |
| break; |
| } |
| |
| if (trans->conn) |
| put_subscr_con(trans->conn); |
| |
| if (!trans->conn && trans->subscr && trans->subscr->net) { |
| /* Stop paging on all bts' */ |
| paging_request_stop(NULL, trans->subscr, NULL); |
| } |
| |
| if (trans->subscr) |
| subscr_put(trans->subscr); |
| |
| llist_del(&trans->entry); |
| |
| talloc_free(trans); |
| } |
| |
| /* allocate an unused transaction ID for the given subscriber |
| * in the given protocol using the ti_flag specified */ |
| int trans_assign_trans_id(struct gsm_subscriber *subscr, |
| u_int8_t protocol, u_int8_t ti_flag) |
| { |
| struct gsm_network *net = subscr->net; |
| 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 (subscr,proto) */ |
| llist_for_each_entry(trans, &net->trans_list, entry) { |
| if (trans->subscr != subscr || |
| 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; |
| } |
| |
| /* update all transactions to use a different LCHAN, e.g. |
| * after handover has succeeded */ |
| int trans_lchan_change(struct gsm_subscriber_connection *conn_old, |
| struct gsm_subscriber_connection *conn_new) |
| { |
| struct gsm_network *net = conn_old->lchan->ts->trx->bts->network; |
| struct gsm_trans *trans; |
| int num = 0; |
| |
| llist_for_each_entry(trans, &net->trans_list, entry) { |
| if (trans->conn == conn_old) { |
| |
| /* drop old channel use count */ |
| put_subscr_con(conn_old); |
| /* assign new channel */ |
| trans->conn = conn_new; |
| /* bump new channel use count */ |
| use_subscr_con(conn_new); |
| num++; |
| } |
| } |
| |
| return num; |
| } |