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
|
/* Maintain and generate ASCI notifications */
/*
* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* Author: Harald Welte
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/gsm/protocol/gsm_08_58.h>
#include <osmo-bts/bts.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/notification.h>
static struct asci_notification *bts_asci_notification_find(struct gsm_bts *bts, const uint8_t *group_call_ref)
{
struct asci_notification *n;
llist_for_each_entry(n, &bts->asci.notifications, list) {
if (!memcmp(n->group_call_ref, group_call_ref, sizeof(n->group_call_ref)))
return n;
}
return NULL;
}
int bts_asci_notification_add(struct gsm_bts *bts, const uint8_t *group_call_ref, const uint8_t *chan_desc,
uint8_t chan_desc_len, const struct rsl_ie_nch_drx_info *nch_drx_info)
{
struct asci_notification *n;
if (bts_asci_notification_find(bts, group_call_ref))
return -EEXIST;
n = talloc_zero(bts, struct asci_notification);
if (!n)
return -ENOMEM;
memcpy(n->group_call_ref, group_call_ref, sizeof(n->group_call_ref));
if (chan_desc && chan_desc_len) {
n->chan_desc.present = true;
n->chan_desc.len = chan_desc_len;
memcpy(&n->chan_desc.value, chan_desc, chan_desc_len);
}
if (nch_drx_info) {
n->nch_drx_info.present = true;
n->nch_drx_info.value = *nch_drx_info;
}
LOGP(DASCI, LOGL_INFO, "Added ASCI Notification for group call reference %s\n",
osmo_hexdump_nospc(n->group_call_ref, ARRAY_SIZE(n->group_call_ref)));
/* add at beginning of "queue" to make sure a new call is notified first */
llist_add(&n->list, &bts->asci.notifications);
return 0;
}
int bts_asci_notification_del(struct gsm_bts *bts, const uint8_t *group_call_ref)
{
struct asci_notification *n = bts_asci_notification_find(bts, group_call_ref);
if (!n)
return -ENODEV;
LOGP(DASCI, LOGL_INFO, "Deleting ASCI Notification for group call reference %s\n",
osmo_hexdump_nospc(n->group_call_ref, ARRAY_SIZE(n->group_call_ref)));
llist_del(&n->list);
talloc_free(n);
return 0;
}
int bts_asci_notification_reset(struct gsm_bts *bts)
{
struct asci_notification *n, *n2;
LOGP(DASCI, LOGL_INFO, "Deleting all %u ASCI Notifications of BTS\n",
llist_count(&bts->asci.notifications));
llist_for_each_entry_safe(n, n2, &bts->asci.notifications, list) {
llist_del(&n->list);
talloc_free(n);
}
return 0;
}
const struct asci_notification *bts_asci_notification_get_next(struct gsm_bts *bts)
{
struct asci_notification *n;
n = llist_first_entry_or_null(&bts->asci.notifications, struct asci_notification, list);
if (!n)
return NULL;
/* move to end of list to iterate over them */
llist_del(&n->list);
llist_add_tail(&n->list, &bts->asci.notifications);
return n;
}
/*! append a "Group Call Information" CSN.1 structure to the caller-provided bit-vector.
* \param[out] bv caller-provided output bit-vector
* \param[in] gcr 5-byte group call reference
* \param[in] ch_desc optional group channel description (may be NULL)
* \param[in] ch_desc_len length of group channel description (in bytes) */
void append_group_call_information(struct bitvec *bv, const uint8_t *gcr, const uint8_t *ch_desc, uint8_t ch_desc_len)
{
/* spec reference: TS 44.018 Section 9.1.21a */
/* <Group Call Reference : bit(36)> */
struct bitvec *gcr_bv = bitvec_alloc(5*8, NULL);
OSMO_ASSERT(gcr_bv);
bitvec_unpack(gcr_bv, gcr);
for (unsigned int i = 0; i < 36; i++)
bitvec_set_bit(bv, bitvec_get_bit_pos(gcr_bv, i));
/* Group Channel Description */
if (ch_desc && ch_desc_len) {
struct bitvec *chd_bv = bitvec_alloc(ch_desc_len*8, NULL);
OSMO_ASSERT(chd_bv);
bitvec_unpack(chd_bv, ch_desc);
bitvec_set_bit(bv, 1);
/* <Channel Description : bit(24)> */
for (unsigned int i = 0; i < ch_desc_len * 8; i++)
bitvec_set_bit(bv, bitvec_get_bit_pos(chd_bv, i));
bitvec_free(chd_bv);
/* FIXME: hopping */
bitvec_set_bit(bv, 0);
} else {
bitvec_set_bit(bv, 0);
}
bitvec_free(gcr_bv);
}
|
