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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/* Paging helper and manager.... */
/* (C) 2009 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 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.
*
*/
/*
* Relevant specs:
* 12.21:
* - 9.4.12 for CCCH Local Threshold
*
* 05.58:
* - 8.5.2 CCCH Load indication
* - 9.3.15 Paging Load
*
* Approach:
* - Send paging command to subscriber
* - On Channel Request we will remember the reason
* - After the ACK we will request the identity
* - Then we will send assign the gsm_subscriber and
* - and call a callback
*/
#include <stdio.h>
#include <stdlib.h>
#include <openbsc/paging.h>
#include <openbsc/debug.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/gsm_04_08.h>
#define PAGING_TIMEOUT 1, 75000
#define MAX_PAGING_REQUEST 750
static LLIST_HEAD(managed_bts);
static unsigned int calculate_group(struct gsm_bts *bts, struct gsm_subscriber *subscr)
{
int ccch_conf;
int bs_cc_chans;
int blocks;
unsigned int group;
ccch_conf = bts->chan_desc.ccch_conf;
bs_cc_chans = rsl_ccch_conf_to_bs_cc_chans(ccch_conf);
/* code word + 2, as 2 channels equals 0x0 */
blocks = rsl_number_of_paging_subchannels(bts);
group = get_paging_group(str_to_imsi(subscr->imsi),
bs_cc_chans, blocks);
return group;
}
/*
* Kill one paging request update the internal list...
*/
static void page_remove_request(struct paging_bts *paging_bts,
struct paging_request *to_be_deleted)
{
/* Update the last_request if that is necessary */
if (to_be_deleted == paging_bts->last_request) {
paging_bts->last_request =
(struct paging_request *)paging_bts->last_request->entry.next;
if (&to_be_deleted->entry == &paging_bts->pending_requests)
paging_bts->last_request = NULL;
}
llist_del(&to_be_deleted->entry);
free(to_be_deleted);
}
static void page_handle_pending_requests(void *data) {
u_int8_t mi[128];
unsigned long int tmsi;
unsigned int mi_len;
unsigned int pag_group;
struct paging_bts *paging_bts = (struct paging_bts *)data;
struct paging_request *request = NULL;
if (!paging_bts->last_request)
paging_bts->last_request =
(struct paging_request *)paging_bts->pending_requests.next;
if (&paging_bts->last_request->entry == &paging_bts->pending_requests) {
paging_bts->last_request = NULL;
return;
}
/* handle the paging request now */
request = paging_bts->last_request;
DEBUGP(DPAG, "Going to send paging commands: '%s'\n",
request->subscr->imsi);
++request->requests;
pag_group = calculate_group(paging_bts->bts, request->subscr);
tmsi = strtoul(request->subscr->tmsi, NULL, 10);
mi_len = generate_mid_from_tmsi(mi, tmsi);
rsl_paging_cmd(paging_bts->bts, pag_group, mi_len, mi,
request->chan_type);
if (request->requests > MAX_PAGING_REQUEST) {
page_remove_request(paging_bts, request);
} else {
/* move to the next item */
paging_bts->last_request =
(struct paging_request *)paging_bts->last_request->entry.next;
if (&paging_bts->last_request->entry == &paging_bts->pending_requests)
paging_bts->last_request = NULL;
}
schedule_timer(&paging_bts->page_timer, PAGING_TIMEOUT);
}
static int page_pending_request(struct paging_bts *bts,
struct gsm_subscriber *subscr) {
struct paging_request *req;
llist_for_each_entry(req, &bts->pending_requests, entry) {
if (subscr == req->subscr)
return 1;
}
return 0;
}
struct paging_bts* page_allocate(struct gsm_bts *bts) {
struct paging_bts *page;
page = (struct paging_bts *)malloc(sizeof(*page));
memset(page, 0, sizeof(*page));
page->bts = bts;
INIT_LLIST_HEAD(&page->pending_requests);
page->page_timer.cb = page_handle_pending_requests;
page->page_timer.data = page;
llist_add_tail(&page->bts_list, &managed_bts);
return page;
}
void page_request(struct gsm_bts *bts, struct gsm_subscriber *subscr, int type) {
struct paging_bts *bts_entry;
struct paging_request *req;
req = (struct paging_request *)malloc(sizeof(*req));
memset(req, 0, sizeof(*req));
req->subscr = subscr_get(subscr);
req->bts = bts;
req->chan_type = type;
llist_for_each_entry(bts_entry, &managed_bts, bts_list) {
if (bts == bts_entry->bts) {
if (!page_pending_request(bts_entry, subscr)) {
llist_add_tail(&req->entry, &bts_entry->pending_requests);
if (!timer_pending(&bts_entry->page_timer))
schedule_timer(&bts_entry->page_timer, PAGING_TIMEOUT);
} else {
DEBUGP(DPAG, "Paging request already pending\n");
}
return;
}
}
DEBUGP(DPAG, "Paging request for not managed BTS\n");
free(req);
return;
}
/* we consciously ignore the type of the request here */
void page_request_stop(struct gsm_bts *bts, struct gsm_subscriber *subscr)
{
struct paging_bts *bts_entry;
struct paging_request *req, *req2;
llist_for_each_entry(bts_entry, &managed_bts, bts_list) {
if (bts == bts_entry->bts)
break;
}
if (!bts_entry)
return;
llist_for_each_entry_safe(req, req2, &bts_entry->pending_requests,
entry) {
if (req->subscr == subscr) {
page_remove_request(bts_entry, req);
break;
}
}
}
|
