forked from cellular-infrastructure/osmo-bsc-nat
Reply to BSC's RESET with RESET ACK directly
Let the BSCNAT directly reply to RESET sent from BSC with RESET ACK. bssap_ran_handle_reset() is a bit empty right now but will be used in a future patch to store the BSC. Related: SYS#5560 Related: https://osmocom.org/projects/osmo-bscnat/wiki/AoIP_OsmoBSCNAT#RESET Change-Id: I3223409e25c93b625d67634caf68efe9772e2558
This commit is contained in:
parent
8ca3a1ad8f
commit
d0059e2bd2
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@ -1,6 +1,7 @@
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noinst_HEADERS = \
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bsc_nat.h \
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bsc_nat_fsm.h \
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bssap.h \
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logging.h \
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vty.h \
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$(NULL)
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@ -0,0 +1,25 @@
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/* (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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#pragma once
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#include <osmocom/bsc_nat/bsc_nat.h>
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int bssap_handle_udt(struct bsc_nat_sccp_inst *sccp_inst, struct osmo_sccp_addr *addr, struct msgb *msgb,
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unsigned int length);
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@ -27,6 +27,7 @@ bin_PROGRAMS = \
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osmo_bsc_nat_SOURCES = \
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bsc_nat.c \
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bsc_nat_fsm.c \
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bssap.c \
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logging.c \
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main.c \
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vty.c \
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@ -27,6 +27,7 @@
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#include <osmocom/sigtran/sccp_helpers.h>
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#include <osmocom/bsc_nat/bsc_nat.h>
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#include <osmocom/bsc_nat/bsc_nat_fsm.h>
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#include <osmocom/bsc_nat/bssap.h>
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#include <osmocom/bsc_nat/logging.h>
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#define DEFAULT_PC_RAN "0.23.1" /* same as default for OsmoMSC */
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@ -299,6 +300,10 @@ static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
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case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):
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/* connection-less data received */
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rc = bssap_handle_udt(sccp_inst, &prim->u.unitdata.calling_addr, oph->msg, msgb_l2len(oph->msg));
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/* FIXME: don't forward this to the MSC anymore, as soon as the
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* BSCNAT is able to do the RESET to MSC by itself. */
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addr = &prim->u.unitdata.calling_addr;
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if (sccp_sap_get_peer_addr_out(sccp_inst, addr, &peer_addr_out) < 0)
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@ -314,7 +319,6 @@ static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
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&peer_addr_out,
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oph->msg->data,
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msgb_length(oph->msg));
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rc = 0;
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break;
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default:
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@ -0,0 +1,98 @@
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/* (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/sigtran/sccp_sap.h>
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#include <osmocom/bsc_nat/bsc_nat.h>
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#include <osmocom/bsc_nat/logging.h>
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static int bssap_ran_handle_reset(struct osmo_sccp_addr *addr, struct msgb *msg, unsigned int length)
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{
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struct bsc_nat_sccp_inst *sccp_inst = g_bsc_nat->ran;
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LOGP(DMAIN, LOGL_NOTICE, "Rx RESET from %s\n", bsc_nat_print_addr(sccp_inst, addr));
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LOGP(DMAIN, LOGL_NOTICE, "Tx RESET ACK to %s\n", bsc_nat_print_addr(sccp_inst, addr));
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msg = gsm0808_create_reset_ack();
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return osmo_sccp_tx_unitdata_msg(sccp_inst->scu, &sccp_inst->addr, addr, msg);
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}
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static int bssap_ran_rcvmsg_udt(struct osmo_sccp_addr *addr, 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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case BSS_MAP_MSG_RESET:
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ret = bssap_ran_handle_reset(addr, msg, length);
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break;
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default:
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LOGP(DMAIN, LOGL_NOTICE, "Unimplemented BSSMAP UDT %s\n", gsm0808_bssap_name(msg->l3h[0]));
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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 bssap_rcvmsg_udt(struct bsc_nat_sccp_inst *sccp_inst, struct osmo_sccp_addr *addr, 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 UDT BSSMAP %s\n", gsm0808_bssap_name(msg->l3h[0]));
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/* NOTE: bssap_cn_rcvmsg_udt() will be added in a future patch */
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return bssap_ran_rcvmsg_udt(addr, msg, length);
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}
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int bssap_handle_udt(struct bsc_nat_sccp_inst *sccp_inst, struct osmo_sccp_addr *addr, struct msgb *msgb,
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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 UDT: %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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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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switch (bs->type) {
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case BSSAP_MSG_BSS_MANAGEMENT:
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msgb->l3h = &msgb->l2h[sizeof(*bs)];
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rc = bssap_rcvmsg_udt(sccp_inst, addr, msgb, length - sizeof(*bs));
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break;
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default:
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LOGP(DMAIN, LOGL_NOTICE, "Unimplemented msg type: %s\n", gsm0808_bssap_name(bs->type));
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}
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return rc;
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}
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