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
|
/* Mapper between RUA ContextID (24 bit, per HNB) and the SUA/SCCP
* Connection ID (32bit, per signalling link) */
/* (C) 2015 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 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/>.
*
*/
/* an expired mapping is destroyed after 1..2 * EXPIRY_TIMER_SECS */
#define EXPIRY_TIMER_SECS 23
#include <osmocom/core/timer.h>
#include <osmocom/iuh/hnbgw.h>
#include <osmocom/iuh/context_map.h>
const struct value_string hnbgw_context_map_state_names[] = {
{MAP_S_NULL , "not-initialized"},
{MAP_S_ACTIVE , "active"},
{MAP_S_RESERVED1, "inactive-reserved"},
{MAP_S_RESERVED2, "inactive-discard"},
{0, NULL}
};
/* is a given SCCP USER SAP Connection ID in use for a given CN link? */
static int cn_id_in_use(struct hnbgw_cnlink *cn, uint32_t id)
{
struct hnbgw_context_map *map;
llist_for_each_entry(map, &cn->map_list, cn_list) {
if (map->scu_conn_id == id)
return 1;
}
return 0;
}
/* try to allocate a new SCCP User SAP Connection ID */
static int alloc_cn_conn_id(struct hnbgw_cnlink *cn, uint32_t *id_out)
{
uint32_t i;
uint32_t id;
for (i = 0; i < 0xffffffff; i++) {
id = cn->next_conn_id++;
if (!cn_id_in_use(cn, id)) {
*id_out = id;
return 1;
}
}
return -1;
}
/* Map from a HNB + ContextID to the SCCP-side Connection ID */
struct hnbgw_context_map *
context_map_alloc_by_hnb(struct hnb_context *hnb, uint32_t rua_ctx_id,
bool is_ps,
struct hnbgw_cnlink *cn_if_new)
{
struct hnbgw_context_map *map;
uint32_t new_scu_conn_id;
llist_for_each_entry(map, &hnb->map_list, hnb_list) {
if (map->state != MAP_S_ACTIVE)
continue;
if (map->cn_link != cn_if_new) {
continue;
}
if (map->rua_ctx_id == rua_ctx_id
&& map->is_ps == is_ps) {
return map;
}
}
if (alloc_cn_conn_id(cn_if_new, &new_scu_conn_id) < 0) {
LOGHNB(hnb, DMAIN, LOGL_ERROR, "Unable to allocate CN connection ID\n");
return NULL;
}
LOGHNB(hnb, DMAIN, LOGL_INFO, "Creating new Mapping RUA CTX %p/%u <-> SCU Conn ID %p/%u\n",
hnb, rua_ctx_id, cn_if_new, new_scu_conn_id);
/* alloate a new map entry */
map = talloc_zero(hnb, struct hnbgw_context_map);
map->state = MAP_S_NULL;
map->cn_link = cn_if_new;
map->hnb_ctx = hnb;
map->rua_ctx_id = rua_ctx_id;
map->is_ps = is_ps;
map->scu_conn_id = new_scu_conn_id;
/* put it into both lists */
llist_add_tail(&map->hnb_list, &hnb->map_list);
llist_add_tail(&map->cn_list, &cn_if_new->map_list);
map->state = MAP_S_ACTIVE;
return map;
}
/* Map from a CN + Connection ID to HNB + Context ID */
struct hnbgw_context_map *
context_map_by_cn(struct hnbgw_cnlink *cn, uint32_t scu_conn_id)
{
struct hnbgw_context_map *map;
llist_for_each_entry(map, &cn->map_list, cn_list) {
if (map->state != MAP_S_ACTIVE)
continue;
if (map->scu_conn_id == scu_conn_id) {
return map;
}
}
/* we don't allocate new mappings in the CN->HNB
* direction, as the RUA=SCCP=SUA connections are always
* established from HNB towards CN. */
LOGP(DMAIN, LOGL_NOTICE, "Unable to resolve map for CN " "connection ID %p/%u\n", cn, scu_conn_id);
return NULL;
}
void context_map_deactivate(struct hnbgw_context_map *map)
{
/* set the state to reserved. We still show up in the list and
* avoid re-allocation of the context-id until we are cleaned up
* by the context_map garbage collector timer */
if (map->state != MAP_S_RESERVED2)
map->state = MAP_S_RESERVED1;
}
static struct osmo_timer_list context_map_tmr;
static void context_map_tmr_cb(void *data)
{
struct hnb_gw *gw = data;
struct hnbgw_cnlink *cn = gw->sccp.cnlink;
struct hnbgw_context_map *map, *next_map;
DEBUGP(DMAIN, "Running context mapper garbage collection\n");
llist_for_each_entry_safe(map, next_map, &cn->map_list, cn_list) {
switch (map->state) {
case MAP_S_RESERVED1:
/* first time we see this reserved
* entry: mark it for stage 2 */
map->state = MAP_S_RESERVED2;
break;
case MAP_S_RESERVED2:
/* second time we see this reserved
* entry: remove it */
map->state = MAP_S_NULL;
llist_del(&map->cn_list);
llist_del(&map->hnb_list);
talloc_free(map);
break;
default:
break;
}
}
/* re-schedule this timer */
osmo_timer_schedule(&context_map_tmr, EXPIRY_TIMER_SECS, 0);
}
int context_map_init(struct hnb_gw *gw)
{
context_map_tmr.cb = context_map_tmr_cb;
context_map_tmr.data = gw;
osmo_timer_schedule(&context_map_tmr, EXPIRY_TIMER_SECS, 0);
return 0;
}
|
