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/* 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);
}
static int abis_osmo_pcu_tx_neigh_addr_cnf(struct gsm_bts *bts, const struct gsm_pcu_if_neigh_addr_req *naddr_req,
uint8_t err_code, const struct osmo_cell_global_id_ps *cgi_ps)
{
struct msgb *msg = abis_osmo_pcu_msgb_alloc(PCU_IF_MSG_CONTAINER, bts->bts_nr, sizeof(struct gsm_pcu_if_neigh_addr_cnf));
struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *) msgb_data(msg);
struct gsm_pcu_if_neigh_addr_cnf *naddr_cnf = (struct gsm_pcu_if_neigh_addr_cnf *)&pcu_prim->u.container.data[0];
msgb_put(msg, sizeof(pcu_prim->u.container) + sizeof(struct gsm_pcu_if_neigh_addr_cnf));
pcu_prim->u.container.msg_type = PCU_IF_MSG_NEIGH_ADDR_CNF;
osmo_store16be(sizeof(struct gsm_pcu_if_neigh_addr_cnf), &pcu_prim->u.container.length);
naddr_cnf->orig_req = *naddr_req;
naddr_cnf->err_code = err_code;
if (err_code == 0) {
osmo_store16be(cgi_ps->rai.lac.plmn.mcc, &naddr_cnf->cgi_ps.mcc);
osmo_store16be(cgi_ps->rai.lac.plmn.mnc, &naddr_cnf->cgi_ps.mnc);
naddr_cnf->cgi_ps.mnc_3_digits = cgi_ps->rai.lac.plmn.mnc_3_digits;
osmo_store16be(cgi_ps->rai.lac.lac, &naddr_cnf->cgi_ps.lac);
naddr_cnf->cgi_ps.rac = cgi_ps->rai.rac;
osmo_store16be(cgi_ps->cell_identity, &naddr_cnf->cgi_ps.cell_identity);
}
return abis_osmo_pcu_sendmsg(bts, msg);
}
static int rcvmsg_pcu_neigh_addr_req(struct gsm_bts *bts, const struct gsm_pcu_if_neigh_addr_req *naddr_req)
{
struct cell_ab ab;
uint16_t local_lac, local_ci;
struct osmo_cell_global_id_ps cgi_ps;
int rc;
local_lac = osmo_load16be(&naddr_req->local_lac);
local_ci = osmo_load16be(&naddr_req->local_ci);
ab = (struct cell_ab){
.arfcn = osmo_load16be(&naddr_req->tgt_arfcn),
.bsic = naddr_req->tgt_bsic,
};
LOGP(DNM, LOGL_INFO, "(bts=%d) Rx Neighbor Address Resolution Req (ARFCN=%u,BSIC=%u) from (LAC=%u,CI=%u)\n",
bts->nr, ab.arfcn, ab.bsic, local_lac, local_ci);
if (!cell_ab_valid(&ab)) {
rc = 2;
goto do_fail;
}
if (neighbor_address_resolution(bts->network, &ab, local_lac, local_ci, &cgi_ps) < 0) {
rc = 1;
goto do_fail;
}
return abis_osmo_pcu_tx_neigh_addr_cnf(bts, naddr_req, 0, &cgi_ps);
do_fail:
return abis_osmo_pcu_tx_neigh_addr_cnf(bts, naddr_req, rc, NULL);
}
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_NEIGH_ADDR_REQ:
if (data_length < sizeof(struct gsm_pcu_if_neigh_addr_req)) {
LOGP(DNM, LOGL_ERROR, "ABIS_OSMO_PCU CONTAINER ANR_CNF message too short\n");
return -EINVAL;
}
rc = rcvmsg_pcu_neigh_addr_req(bts, (struct gsm_pcu_if_neigh_addr_req *)&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);
}
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