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/*
* (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* Author: Neels Hofmeyr
*
* 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 <osmocom/core/logging.h>
#include <osmocom/sccp/sccp_types.h>
#include <osmocom/sigtran/sccp_sap.h>
#include <osmocom/sigtran/sccp_helpers.h>
#include <osmocom/msc/debug.h>
#include <osmocom/msc/sccp_ran.h>
#include <osmocom/msc/ran_infra.h>
struct osmo_tdef g_sccp_tdefs[] = {
{}
};
static int sccp_ran_sap_up(struct osmo_prim_hdr *oph, void *_scu);
struct sccp_ran_inst *sccp_ran_init(void *talloc_ctx, struct osmo_sccp_instance *sccp, enum osmo_sccp_ssn ssn,
const char *sccp_user_name, struct ran_infra *ran, void *user_data)
{
struct sccp_ran_inst *sri = talloc(talloc_ctx, struct sccp_ran_inst);
*sri = (struct sccp_ran_inst){
.ran = ran,
.sccp = sccp,
.user_data = user_data,
};
INIT_LLIST_HEAD(&sri->ran_peers);
INIT_LLIST_HEAD(&sri->ran_conns);
osmo_sccp_local_addr_by_instance(&sri->local_sccp_addr, sccp, ssn);
sri->scu = osmo_sccp_user_bind(sccp, sccp_user_name, sccp_ran_sap_up, ssn);
osmo_sccp_user_set_priv(sri->scu, sri);
OSMO_ASSERT(!ran->sri);
ran->sri = sri;
return sri;
}
static int sccp_ran_sap_up(struct osmo_prim_hdr *oph, void *_scu)
{
struct osmo_sccp_user *scu = _scu;
struct sccp_ran_inst *sri = osmo_sccp_user_get_priv(scu);
struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph;
struct osmo_sccp_addr *my_addr;
struct osmo_sccp_addr *peer_addr;
uint32_t conn_id;
int rc;
if (!sri->ran || !sri->ran->sccp_ran_ops.up_l2) {
LOG_SCCP_RAN_CL(sri, NULL, LOGL_ERROR, "This RAN type is not set up\n");
msgb_free(oph->msg);
return -1;
}
switch (OSMO_PRIM_HDR(oph)) {
case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION):
/* indication of new inbound connection request */
conn_id = prim->u.connect.conn_id;
my_addr = &prim->u.connect.called_addr;
peer_addr = &prim->u.connect.calling_addr;
LOG_SCCP_RAN_CO(sri, peer_addr, conn_id, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph));
if (!msgb_l2(oph->msg) || msgb_l2len(oph->msg) == 0) {
LOG_SCCP_RAN_CO(sri, peer_addr, conn_id, LOGL_NOTICE, "Received invalid N-CONNECT.ind\n");
rc = -1;
break;
}
if (osmo_sccp_addr_ri_cmp(&sri->local_sccp_addr, my_addr))
LOG_SCCP_RAN_CO(sri, NULL, conn_id, LOGL_INFO,
"Called address is %s which is not the locally configured address\n",
osmo_sccp_inst_addr_name(sri->sccp, my_addr));
/* ensure the local SCCP socket is ACTIVE */
osmo_sccp_tx_conn_resp(scu, conn_id, my_addr, NULL, 0);
rc = sri->ran->sccp_ran_ops.up_l2(sri, peer_addr, true, conn_id, oph->msg);
if (rc)
osmo_sccp_tx_disconn(scu, conn_id, my_addr, SCCP_RETURN_CAUSE_UNQUALIFIED);
break;
case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
/* connection-oriented data received */
conn_id = prim->u.data.conn_id;
LOG_SCCP_RAN_CO(sri, NULL, conn_id, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph));
rc = sri->ran->sccp_ran_ops.up_l2(sri, NULL, true, conn_id, oph->msg);
break;
case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION):
/* indication of disconnect */
conn_id = prim->u.disconnect.conn_id;
LOG_SCCP_RAN_CO(sri, NULL, conn_id, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph));
/* If there is no L2 payload in the N-DISCONNECT, no need to dispatch up_l2(). */
if (msgb_l2len(oph->msg))
rc = sri->ran->sccp_ran_ops.up_l2(sri, NULL, true, conn_id, oph->msg);
else
rc = 0;
/* Make sure the ran_conn is dropped. It might seem more optimal to combine the disconnect() into
* up_l2(), but since an up_l2() dispatch might already cause the ran_conn to be discarded for other
* reasons, a separate disconnect() with a separate conn_id lookup is actually necessary. */
sri->ran->sccp_ran_ops.disconnect(sri, conn_id);
break;
case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):
/* connection-less data received */
my_addr = &prim->u.unitdata.called_addr;
peer_addr = &prim->u.unitdata.calling_addr;
LOG_SCCP_RAN_CL(sri, peer_addr, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph));
if (osmo_sccp_addr_ri_cmp(&sri->local_sccp_addr, my_addr))
LOG_SCCP_RAN_CL(sri, NULL, LOGL_INFO,
"Called address is %s which is not the locally configured address\n",
osmo_sccp_inst_addr_name(sri->sccp, my_addr));
rc = sri->ran->sccp_ran_ops.up_l2(sri, peer_addr, false, 0, oph->msg);
break;
default:
LOG_SCCP_RAN_CL(sri, NULL, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph));
rc = -1;
break;
}
msgb_free(oph->msg);
return rc;
}
/* Push some padding if necessary to reach a multiple-of-eight offset to be msgb_push() an osmo_scu_prim that will then
* be 8-byte aligned. */
static void msgb_pad_mod8(struct msgb *msg)
{
uint8_t mod8 = (intptr_t)(msg->data) % 8;
if (mod8)
msgb_push(msg, mod8);
}
int sccp_ran_down_l2_co_initial(struct sccp_ran_inst *sri,
const struct osmo_sccp_addr *called_addr,
uint32_t conn_id, struct msgb *l2)
{
struct osmo_scu_prim *prim;
l2->l2h = l2->data;
msgb_pad_mod8(l2);
prim = (struct osmo_scu_prim *) msgb_push(l2, sizeof(*prim));
prim->u.connect = (struct osmo_scu_connect_param){
.called_addr = *called_addr,
.calling_addr = sri->local_sccp_addr,
.sccp_class = 2,
//.importance = ?,
.conn_id = conn_id,
};
osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_REQUEST, l2);
return osmo_sccp_user_sap_down_nofree(sri->scu, &prim->oph);
}
int sccp_ran_down_l2_co(struct sccp_ran_inst *sri, uint32_t conn_id, struct msgb *l2)
{
struct osmo_scu_prim *prim;
l2->l2h = l2->data;
msgb_pad_mod8(l2);
prim = (struct osmo_scu_prim *) msgb_push(l2, sizeof(*prim));
prim->u.data.conn_id = conn_id;
osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_DATA, PRIM_OP_REQUEST, l2);
return osmo_sccp_user_sap_down_nofree(sri->scu, &prim->oph);
}
int sccp_ran_down_l2_cl(struct sccp_ran_inst *sri, const struct osmo_sccp_addr *called_addr, struct msgb *l2)
{
struct osmo_scu_prim *prim;
l2->l2h = l2->data;
msgb_pad_mod8(l2);
prim = (struct osmo_scu_prim *) msgb_push(l2, sizeof(*prim));
prim->u.unitdata = (struct osmo_scu_unitdata_param){
.called_addr = *called_addr,
.calling_addr = sri->local_sccp_addr,
};
osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_REQUEST, l2);
return osmo_sccp_user_sap_down_nofree(sri->scu, &prim->oph);
}
int sccp_ran_disconnect(struct sccp_ran_inst *sri, uint32_t conn_id, uint32_t cause)
{
return osmo_sccp_tx_disconn(sri->scu, conn_id, NULL, cause);
}
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