121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
/* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Oliver Smith <osmith@sysmocom.de>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/lienses/>.
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*
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*/
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#include "config.h"
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#include <osmocom/core/msgb.h>
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#include <osmocom/gsm/gsm0808.h>
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#include <osmocom/sigtran/sccp_helpers.h>
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#include <osmocom/bsc_nat/logging.h>
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#include <osmocom/bsc_nat/subscr_conn.h>
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static int bssap_fwd_to_cn(struct subscr_conn *subscr_conn, struct msgb *msg, unsigned int length)
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{
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LOGP(DMAIN, LOGL_DEBUG, "Fwd BSSAP to CN via %s\n", talloc_get_name(subscr_conn));
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msgb_pull_to_l2(msg);
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return osmo_sccp_tx_data(g_bsc_nat->cn.sccp_inst->scu, subscr_conn->cn.id, msg->data, msgb_length(msg));
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}
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static int bssap_fwd_to_ran(struct subscr_conn *subscr_conn, struct msgb *msg, unsigned int length)
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{
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LOGP(DMAIN, LOGL_DEBUG, "Fwd BSSAP to RAN via %s\n", talloc_get_name(subscr_conn));
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msgb_pull_to_l2(msg);
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return osmo_sccp_tx_data(g_bsc_nat->ran.sccp_inst->scu, subscr_conn->ran.id, msg->data, msgb_length(msg));
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}
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static int bssmap_cn_rcvmsg_dt(struct subscr_conn *subscr_conn, struct msgb *msg, unsigned int length)
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{
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int ret = 0;
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switch (msg->l3h[0]) {
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default:
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ret = bssap_fwd_to_ran(subscr_conn, msg, length);
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break;
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}
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return ret;
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}
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static int bssmap_ran_rcvmsg_dt(struct subscr_conn *subscr_conn, struct msgb *msg, unsigned int length)
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{
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int ret = 0;
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switch (msg->l3h[0]) {
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default:
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ret = bssap_fwd_to_cn(subscr_conn, msg, length);
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break;
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}
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return ret;
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}
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static int bssmap_rcvmsg_dt(enum bsc_nat_net net, struct subscr_conn *subscr_conn, struct msgb *msg,
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unsigned int length)
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{
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if (length < 1) {
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LOGP(DMAIN, LOGL_ERROR, "Not enough room: %u\n", length);
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return -1;
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}
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LOGP(DMAIN, LOGL_NOTICE, "Rx DT BSSMAP %s\n", gsm0808_bssmap_name(msg->l3h[0]));
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if (net == BSC_NAT_NET_CN)
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return bssmap_cn_rcvmsg_dt(subscr_conn, msg, length);
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return bssmap_ran_rcvmsg_dt(subscr_conn, msg, length);
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}
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int bssap_handle_dt(enum bsc_nat_net net, struct subscr_conn *subscr_conn, struct msgb *msgb, unsigned int length)
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{
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struct bssmap_header *bs;
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int rc = -1;
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LOGP(DMAIN, LOGL_DEBUG, "Rx DT: %s\n", osmo_hexdump(msgb->l2h, length));
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if (length < sizeof(*bs)) {
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LOGP(DMAIN, LOGL_ERROR, "The header is too short\n");
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return -1;
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}
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switch (msgb->l2h[0]) {
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case BSSAP_MSG_BSS_MANAGEMENT:
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bs = (struct bssmap_header *)msgb->l2h;
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if (bs->length < length - sizeof(*bs)) {
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LOGP(DMAIN, LOGL_ERROR, "Failed to parse BSSMAP header\n");
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return -1;
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}
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msgb->l3h = &msgb->l2h[sizeof(*bs)];
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rc = bssmap_rcvmsg_dt(net, subscr_conn, msgb, length - sizeof(*bs));
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break;
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case BSSAP_MSG_DTAP:
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LOGP(DMAIN, LOGL_DEBUG, "Rx DT DTAP\n");
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if (net == BSC_NAT_NET_CN)
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rc = bssap_fwd_to_ran(subscr_conn, msgb, length);
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else
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rc = bssap_fwd_to_cn(subscr_conn, msgb, length);
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break;
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default:
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LOGP(DMAIN, LOGL_ERROR, "%s(%s) is not implemented!\n", __func__, gsm0808_bssap_name(msgb->l2h[0]));
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}
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return rc;
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}
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