93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/*
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* SCCPlite MGCP handling
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*
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* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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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/licenses/>.
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*
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*/
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#include <osmocom/bsc/bsc_msc_data.h>
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#include <osmocom/bsc/osmo_bsc.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/gsm/ipa.h>
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#include <osmocom/gsm/protocol/ipaccess.h>
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#include <osmocom/bsc/osmo_bsc_sigtran.h>
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#include <arpa/inet.h>
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/* Determine MSC based on the ASP over which the message was received */
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static struct bsc_msc_data *msc_from_asp(struct osmo_ss7_asp *asp)
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{
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int msc_nr;
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/* this is rather ugly, as we of course have MTP-level routing between
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* the local SCCP user (BSC) and the AS/ASPs. However, for the most simple
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* SCCPlite case, there is a 1:1 mapping between ASP and AS, and using
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* the libosmo-sigtran "simple client", the names are "as[p]-clnt-msc-%u",
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* as set in osmo_bsc_sigtran_init() */
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if (sscanf(asp->cfg.name, "asp-clnt-msc-%u", &msc_nr) != 1) {
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LOGP(DMSC, LOGL_ERROR, "Cannot find to which MSC the ASP %s belongs\n", asp->cfg.name);
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return NULL;
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}
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return osmo_msc_data_find(bsc_gsmnet, msc_nr);
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}
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/* We received an IPA-encapsulated MGCP message from a MSC. Transfers msg ownership. */
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int bsc_sccplite_rx_mgcp(struct osmo_ss7_asp *asp, struct msgb *msg)
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{
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struct bsc_msc_data *msc;
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int rc;
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LOGP(DMSC, LOGL_NOTICE, "%s: Received IPA-encapsulated MGCP: %s\n", asp->cfg.name, msg->l2h);
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msc = msc_from_asp(asp);
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if (msc) {
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/* we don't have a write queue here as we simply expect the socket buffers
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* to be large enough to deal with whatever small/infrequent MGCP messages */
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rc = send(msc->mgcp_ipa.ofd.fd, msgb_l2(msg), msgb_l2len(msg), 0);
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} else
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rc = 0;
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msgb_free(msg);
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return rc;
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}
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/* we received some data on the UDP proxy socket from the MGW. Pass it to MSC via IPA */
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int bsc_sccplite_mgcp_proxy_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct bsc_msc_data *msc = ofd->data;
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struct msgb *msg;
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int rc;
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if (!(what & OSMO_FD_READ))
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return 0;
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msg = msgb_alloc_headroom(1024, 16, "MGCP->IPA");
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OSMO_ASSERT(msg);
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rc = recv(ofd->fd, msg->data, msgb_tailroom(msg), 0);
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if (rc <= 0) {
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LOGP(DMSC, LOGL_ERROR, "error receiving data from MGCP<->IPA proxy UDP socket: "
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"%s\n", strerror(errno));
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msgb_free(msg);
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return rc;
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}
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msg->l2h = msgb_put(msg, rc);
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msg->l2h[rc] = '\0';
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LOGP(DMSC, LOGL_NOTICE, "Received MGCP on UDP proxy socket: %s\n", msg->l2h);
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ipa_prepend_header(msg, IPAC_PROTO_MGCP_OLD);
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return bsc_sccplite_msc_send(msc, msg);
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}
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