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
|
/* 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>
#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) )
#if 0
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);
}
#endif
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) {
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);
}
|
