1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* 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 <openbsc/talloc.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/mncc.h>
#include <openbsc/paging.h>
static void *tall_trans_ctx;
struct gsm_trans *trans_find_by_id(struct gsm_lchan *lchan, u_int8_t trans_id)
{
struct gsm_trans *trans;
struct gsm_network *net = lchan->ts->trx->bts->network;
llist_for_each_entry(trans, &net->trans_list, entry) {
if (trans->lchan == lchan && 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)
{
struct gsm_bts *bts;
switch (trans->protocol) {
case GSM48_PDISC_CC:
_gsm48_cc_trans_free(trans);
break;
}
if (trans->lchan)
put_lchan(trans->lchan);
if (!trans->lchan && trans->subscr && trans->subscr->net) {
/* Stop paging on all bts' */
bts = NULL;
do {
bts = gsm_bts_by_lac(trans->subscr->net,
trans->subscr->lac, bts);
if (!bts)
break;
/* Stop paging */
paging_request_stop(bts, trans->subscr, NULL);
} while (1);
}
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;
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);
}
for (i = 0; i <= 7; i++) {
if ((used_tid_bitmask & (1 << (i | ti_flag))) == 0)
return i | ti_flag;
}
return -1;
}
|
