99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
|
|
* Author: Oliver Smith <osmith@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/lienses/>.
|
|
*
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include <osmocom/core/msgb.h>
|
|
#include <osmocom/gsm/gsm0808.h>
|
|
#include <osmocom/sigtran/sccp_helpers.h>
|
|
#include <osmocom/sigtran/sccp_sap.h>
|
|
#include <osmocom/bsc_nat/bsc_nat.h>
|
|
#include <osmocom/bsc_nat/logging.h>
|
|
|
|
static int bssap_ran_handle_reset(struct osmo_sccp_addr *addr, struct msgb *msg, unsigned int length)
|
|
{
|
|
struct bsc_nat_sccp_inst *sccp_inst = g_bsc_nat->ran.sccp_inst;
|
|
|
|
LOGP(DMAIN, LOGL_NOTICE, "Rx RESET from %s\n", bsc_nat_print_addr_ran(addr));
|
|
|
|
LOGP(DMAIN, LOGL_NOTICE, "Tx RESET ACK to %s\n", bsc_nat_print_addr_ran(addr));
|
|
msg = gsm0808_create_reset_ack();
|
|
return osmo_sccp_tx_unitdata_msg(sccp_inst->scu, &sccp_inst->addr, addr, msg);
|
|
}
|
|
|
|
static int bssap_ran_rcvmsg_udt(struct osmo_sccp_addr *addr, struct msgb *msg, unsigned int length)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (msg->l3h[0]) {
|
|
case BSS_MAP_MSG_RESET:
|
|
ret = bssap_ran_handle_reset(addr, msg, length);
|
|
break;
|
|
default:
|
|
LOGP(DMAIN, LOGL_NOTICE, "Unimplemented BSSMAP UDT %s\n", gsm0808_bssap_name(msg->l3h[0]));
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bssap_rcvmsg_udt(struct bsc_nat_sccp_inst *sccp_inst, struct osmo_sccp_addr *addr, struct msgb *msg,
|
|
unsigned int length)
|
|
{
|
|
if (length < 1) {
|
|
LOGP(DMAIN, LOGL_ERROR, "Not enough room: %u\n", length);
|
|
return -1;
|
|
}
|
|
|
|
LOGP(DMAIN, LOGL_NOTICE, "Rx UDT BSSMAP %s\n", gsm0808_bssap_name(msg->l3h[0]));
|
|
|
|
/* NOTE: bssap_cn_rcvmsg_udt() will be added in a future patch */
|
|
return bssap_ran_rcvmsg_udt(addr, msg, length);
|
|
}
|
|
|
|
int bssap_handle_udt(struct bsc_nat_sccp_inst *sccp_inst, struct osmo_sccp_addr *addr, struct msgb *msgb,
|
|
unsigned int length)
|
|
{
|
|
struct bssmap_header *bs;
|
|
int rc = -1;
|
|
|
|
LOGP(DMAIN, LOGL_DEBUG, "Rx UDT: %s\n", osmo_hexdump(msgb->l2h, length));
|
|
|
|
if (length < sizeof(*bs)) {
|
|
LOGP(DMAIN, LOGL_ERROR, "The header is too short\n");
|
|
return -1;
|
|
}
|
|
|
|
bs = (struct bssmap_header *)msgb->l2h;
|
|
if (bs->length < length - sizeof(*bs)) {
|
|
LOGP(DMAIN, LOGL_ERROR, "Failed to parse BSSMAP header\n");
|
|
return -1;
|
|
}
|
|
|
|
switch (bs->type) {
|
|
case BSSAP_MSG_BSS_MANAGEMENT:
|
|
msgb->l3h = &msgb->l2h[sizeof(*bs)];
|
|
rc = bssap_rcvmsg_udt(sccp_inst, addr, msgb, length - sizeof(*bs));
|
|
break;
|
|
default:
|
|
LOGP(DMAIN, LOGL_NOTICE, "Unimplemented msg type: %s\n", gsm0808_bssap_name(bs->type));
|
|
}
|
|
|
|
return rc;
|
|
}
|