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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
/* Osmocom specific protocols over Abis (IPA) */
/* (C) 2021 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
* 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/>.
*
*/
#include <errno.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/protocol/ipaccess.h>
#include <osmocom/gsm/ipa.h>
#include <osmocom/gsm/protocol/gsm_12_21.h>
#include <osmocom/bsc/abis_osmo.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/bts.h>
#include <osmocom/bsc/pcuif_proto.h>
#include <osmocom/bsc/neighbor_ident.h>
#define OM_HEADROOM_SIZE 128
////////////////////////////////////////
// OSMO ABIS extensions (PCU)
///////////////////////////////////////
#define PCUIF_HDR_SIZE ( sizeof(struct gsm_pcu_if) - sizeof(((struct gsm_pcu_if *)0)->u) )
static struct msgb *abis_osmo_pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr, size_t extra_size)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
msg = msgb_alloc_headroom(OM_HEADROOM_SIZE + sizeof(struct gsm_pcu_if) + extra_size,
OM_HEADROOM_SIZE, "IPA/ABIS/OSMO");
/* Only header is filled, caller is responible for reserving + filling
* message type specific contents: */
msgb_put(msg, PCUIF_HDR_SIZE);
pcu_prim = (struct gsm_pcu_if *) msgb_data(msg);
pcu_prim->msg_type = msg_type;
pcu_prim->bts_nr = bts_nr;
return msg;
}
/* Send a OML NM Message from BSC to BTS */
static int abis_osmo_pcu_sendmsg(struct gsm_bts *bts, struct msgb *msg)
{
ipa_prepend_header_ext(msg, IPAC_PROTO_EXT_PCU);
return abis_osmo_sendmsg(bts, msg);
}
int abis_osmo_pcu_tx_anr_req(struct gsm_bts *bts, const struct gsm48_cell_desc *cell_desc_li, unsigned int num_cells)
{
struct msgb *msg = abis_osmo_pcu_msgb_alloc(PCU_IF_MSG_CONTAINER, bts->bts_nr, sizeof(struct gsm_pcu_if_anr_req));
struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *) msgb_data(msg);
struct gsm_pcu_if_anr_req *anr_req = (struct gsm_pcu_if_anr_req *)&pcu_prim->u.container.data[0];
msgb_put(msg, sizeof(pcu_prim->u.container) + sizeof(struct gsm_pcu_if_anr_req));
pcu_prim->u.container.msg_type = PCU_IF_MSG_ANR_REQ;
osmo_store16be(sizeof(struct gsm_pcu_if_anr_req), &pcu_prim->u.container.length);
anr_req->num_cells = num_cells;
OSMO_ASSERT(num_cells <= ARRAY_SIZE(anr_req->cell_list));
if (num_cells)
memcpy(anr_req->cell_list, cell_desc_li, sizeof(*cell_desc_li) * num_cells);
return abis_osmo_pcu_sendmsg(bts, msg);
}
#define ANR_NEIGH_RXLEV_INVALID 0xff
static int rcvmsg_pcu_anr_cnf(struct gsm_bts *bts, const struct gsm_pcu_if_anr_cnf* anr_cnf)
{
unsigned int i;
struct timespec now;
struct gsm_bts *neigh_bts;
bool neigh_bts_found;
struct neighbor *n;
osmo_clock_gettime(CLOCK_MONOTONIC, &now);
LOGP(DNM, LOGL_INFO, "(bts=%d) Rx ANR Confirmation (%u cells)\n",
bts->nr, anr_cnf->num_cells);
for (i = 0; i < anr_cnf->num_cells; i++) {
const struct gsm48_cell_desc *cell_desc = (const struct gsm48_cell_desc *)&anr_cnf->cell_list[i];
uint16_t arfcn = (cell_desc->arfcn_hi << 8) | cell_desc->arfcn_lo;
uint8_t bsic = (cell_desc->ncc << 3) | cell_desc->bcc;
if (anr_cnf->rxlev_list[i] == ANR_NEIGH_RXLEV_INVALID) {
LOGP(DNM, LOGL_INFO, "(bts=%d) ANR: ARFCN=%u BSIC=%u is NOT a neighbor (not found)\n",
bts->nr, arfcn, bsic);
continue;
}
if (anr_cnf->rxlev_list[i] < bts->network->anr.rxlev_threshold) {
LOGP(DNM, LOGL_INFO,
"(bts=%d) ANR: ARFCN=%u BSIC=%u RXLEV=%u (%d dBm) is NOT a neighbor (< rxlev %u)\n",
bts->nr, arfcn, bsic, anr_cnf->rxlev_list[i], anr_cnf->rxlev_list[i] - 110,
bts->network->anr.rxlev_threshold);
continue;
}
LOGP(DNM, LOGL_INFO, "(bts=%d) ANR: ARFCN=%u BSIC=%u RXLEV=%u (%d dBm) is a neighbor\n",
bts->nr, arfcn, bsic, anr_cnf->rxlev_list[i], anr_cnf->rxlev_list[i] - 110);
/* Find BTS owning ARFCN+BSIC: */
neigh_bts_found = false;
llist_for_each_entry(neigh_bts, &bts->network->bts_list, list) {
if (neigh_bts->c0->arfcn != arfcn || neigh_bts->bsic != bsic)
continue;
neigh_bts_found = true;
break;
}
if (!neigh_bts_found) {
LOGP(DNM, LOGL_NOTICE, "(bts=%d) ANR: ARFCN=%u BSIC=%u RXLEV=%u (%d dBm) matches no BTS configured in BSC!\n",
bts->nr, arfcn, bsic, anr_cnf->rxlev_list[i], anr_cnf->rxlev_list[i] - 110);
continue;
}
/* Try to find existing neighbour and update it. */
neigh_bts_found = false;
llist_for_each_entry(n, &bts->neighbors, entry) {
if (n->type != NEIGHBOR_TYPE_BTS_NR)
continue;
if (n->bts_nr != neigh_bts->nr)
continue;
neigh_bts_found = true;
n->last_meas_detected = now;
break;
}
/* If the neighbour didn't exist yet, create it and add it to the list */
if (!neigh_bts_found) {
LOGP(DNM, LOGL_NOTICE, "(bts=%d) ANR: Added new dynamic neighbor BTS%d\n",
bts->nr, neigh_bts->nr);
n = talloc(bts, struct neighbor);
*n = (struct neighbor){
.type = NEIGHBOR_TYPE_BTS_NR,
.bts_nr = neigh_bts->nr,
.dynamic = true,
.last_meas_detected = now,
};
llist_add_tail(&n->entry, &bts->neighbors);
/* TODO: force re-creation of SI? */
}
}
return 0;
}
static int rcvmsg_pcu_container(struct gsm_bts *bts, struct gsm_pcu_if_container *container, size_t container_len)
{
int rc;
uint16_t data_length = osmo_load16be(&container->length);
if (container_len < sizeof(*container) + data_length) {
LOGP(DNM, LOGL_ERROR, "ABIS_OSMO_PCU CONTAINER message inside (%d) too short\n",
container->msg_type);
return -EINVAL;
}
LOGP(DNM, LOGL_INFO, "(bts=%d) Rx ABIS_OSMO_PCU CONTAINER msg type %u\n",
bts->nr, container->msg_type);
switch (container->msg_type) {
case PCU_IF_MSG_ANR_CNF:
if (data_length < sizeof(struct gsm_pcu_if_anr_cnf)) {
LOGP(DNM, LOGL_ERROR, "ABIS_OSMO_PCU CONTAINER ANR_CNF message too short\n");
return -EINVAL;
}
rc = rcvmsg_pcu_anr_cnf(bts, (struct gsm_pcu_if_anr_cnf*)&container->data);
break;
default:
LOGP(DNM, LOGL_NOTICE, "(bts=%d) Rx ABIS_OSMO_PCU unexpected msg type (%u) inside container!\n",
bts->nr, container->msg_type);
rc = -1;
}
return rc;
}
static int rcvmsg_pcu(struct gsm_bts *bts, struct msgb *msg)
{
struct gsm_pcu_if *pcu_prim;
int rc;
if (msgb_l2len(msg) < PCUIF_HDR_SIZE) {
LOGP(DNM, LOGL_ERROR, "ABIS_OSMO_PCU message too short\n");
return -EIO;
}
pcu_prim = msgb_l2(msg);
LOGP(DNM, LOGL_INFO, "(bts=%d) Rx ABIS_OSMO_PCU msg type %u\n",
pcu_prim->bts_nr, pcu_prim->msg_type);
switch (pcu_prim->msg_type) {
case PCU_IF_MSG_CONTAINER:
if (msgb_l2len(msg) < PCUIF_HDR_SIZE + sizeof(pcu_prim->u.container)) {
LOGP(DNM, LOGL_ERROR, "ABIS_OSMO_PCU CONTAINER message too short\n");
rc = -EINVAL;
} else {
rc = rcvmsg_pcu_container(bts, &pcu_prim->u.container, msgb_l2len(msg) - PCUIF_HDR_SIZE);
}
break;
default:
LOGP(DNM, LOGL_NOTICE, "(bts=%d) Rx ABIS_OSMO_PCU unexpected msg type %u!\n",
pcu_prim->bts_nr, pcu_prim->msg_type);
rc = -1;
}
return rc;
}
////////////////////////////////////////
// OSMO ABIS extensions (generic code)
///////////////////////////////////////
/* High-Level API */
/* Entry-point where L2 OSMO from BTS enters the NM code */
int abis_osmo_rcvmsg(struct msgb *msg)
{
int rc;
struct e1inp_sign_link *link = msg->dst;
struct gsm_bts *bts = link->trx->bts;
uint8_t *osmo_type = msgb_l2(msg);
msg->l2h = osmo_type + 1;
switch (*osmo_type) {
case IPAC_PROTO_EXT_PCU:
rc = rcvmsg_pcu(bts, msg);
break;
default:
LOGP(DNM, LOGL_ERROR, "IPAC_PROTO_EXT 0x%x not supported!\n",
*osmo_type);
rc = -EINVAL;
}
msgb_free(msg);
return rc;
}
/* Send a OML NM Message from BSC to BTS */
int abis_osmo_sendmsg(struct gsm_bts *bts, struct msgb *msg)
{
msg->dst = bts->osmo_link;
msg->l2h = msg->data;
return abis_sendmsg(msg);
}
|
