581 lines
17 KiB
C
581 lines
17 KiB
C
/* (C) 2016 by Harald Welte <laforge@gnumonks.org>
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*
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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 <errno.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/abis/ipa.h>
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#include <osmocom/abis/ipaccess.h>
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#include <osmocom/gsm/gsm48_ie.h>
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#include <osmocom/gsm/apn.h>
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#include <osmocom/gsm/gsm23003.h>
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#include <osmocom/hlr/gsup_server.h>
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#include <osmocom/hlr/gsup_router.h>
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#include <osmocom/hlr/logging.h>
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#define LOG_GSUP_CONN(conn, level, fmt, args...) \
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LOGP(DLGSUP, level, "GSUP peer %s: " fmt, \
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(conn) ? osmo_ipa_name_to_str(&(conn)->peer_name) : "NULL", ##args)
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struct msgb *osmo_gsup_msgb_alloc(const char *label)
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{
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struct msgb *msg = msgb_alloc_headroom(1024+512, 512, label);
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OSMO_ASSERT(msg);
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return msg;
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}
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static void osmo_gsup_server_send(struct osmo_gsup_conn *conn,
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int proto_ext, struct msgb *msg_tx)
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{
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ipa_prepend_header_ext(msg_tx, proto_ext);
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ipa_msg_push_header(msg_tx, IPAC_PROTO_OSMO);
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ipa_server_conn_send(conn->conn, msg_tx);
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}
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int osmo_gsup_conn_send(struct osmo_gsup_conn *conn, struct msgb *msg)
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{
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if (!conn) {
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msgb_free(msg);
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return -ENOTCONN;
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}
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osmo_gsup_server_send(conn, IPAC_PROTO_EXT_GSUP, msg);
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return 0;
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}
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static void gsup_server_send_req_response(struct osmo_gsup_req *req, struct osmo_gsup_message *response)
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{
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struct osmo_gsup_server *server = req->cb_data;
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struct osmo_cni_peer_id *routing;
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struct osmo_gsup_conn *conn = NULL;
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struct msgb *msg = osmo_gsup_msgb_alloc("GSUP Tx");
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int rc;
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if (response->message_type == OSMO_GSUP_MSGT_ROUTING_ERROR
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&& !osmo_cni_peer_id_is_empty(&req->via_proxy)) {
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/* If a routing error occured, we need to route back via the immediate sending peer, not via the
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* intended final recipient -- because one source of routing errors is a duplicate name for a recipient.
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* If we resolve to req->source_name, we may send to a completely unrelated recipient. */
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routing = &req->via_proxy;
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} else {
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routing = &req->source_name;
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}
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switch (routing->type) {
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case OSMO_CNI_PEER_ID_IPA_NAME:
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conn = gsup_route_find_by_ipa_name(server, &routing->ipa_name);
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break;
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default:
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LOG_GSUP_REQ(req, LOGL_ERROR, "GSUP peer id kind not supported: %s\n",
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osmo_cni_peer_id_type_name(routing->type));
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break;
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}
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if (!conn) {
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LOG_GSUP_REQ(req, LOGL_ERROR, "GSUP client that sent this request not found, cannot respond\n");
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msgb_free(msg);
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return;
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}
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if (req->imsi_pseudo[0]) {
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LOGP(DPSEUDO, LOGL_DEBUG, "pseudo IMSI scramble: '%s' => '%s'\n", response->imsi, req->imsi_pseudo);
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strncpy(response->imsi, req->imsi_pseudo, sizeof(response->imsi));
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}
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rc = osmo_gsup_encode(msg, response);
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if (rc) {
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LOG_GSUP_REQ(req, LOGL_ERROR, "Unable to encode: {%s}\n",
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osmo_gsup_message_to_str_c(OTC_SELECT, response));
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msgb_free(msg);
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return;
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}
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rc = osmo_gsup_conn_send(conn, msg);
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if (rc)
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LOG_GSUP_CONN(conn, LOGL_ERROR, "Unable to send: %s\n", osmo_gsup_message_to_str_c(OTC_SELECT, response));
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}
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struct osmo_gsup_req *osmo_gsup_conn_rx(struct osmo_gsup_conn *conn, struct msgb *msg)
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{
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struct osmo_gsup_req *req;
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struct osmo_cni_peer_id cpi = {
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.type = OSMO_CNI_PEER_ID_IPA_NAME,
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.ipa_name = conn->peer_name,
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};
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req = osmo_gsup_req_new(conn->server, &cpi, msg, gsup_server_send_req_response, conn->server, NULL);
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if (!req)
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return NULL;
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if (!osmo_cni_peer_id_is_empty(&req->via_proxy)) {
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switch (req->via_proxy.type) {
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case OSMO_CNI_PEER_ID_IPA_NAME:
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break;
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default:
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LOG_GSUP_REQ(req, LOGL_ERROR, "GSUP peer id kind not supported: %s\n",
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osmo_cni_peer_id_type_name(req->source_name.type));
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osmo_gsup_req_respond_msgt(req, OSMO_GSUP_MSGT_ROUTING_ERROR, true);
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return NULL;
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}
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/* The source of the GSUP message is not the immediate GSUP peer, but that peer is our proxy for that
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* source. Add it to the routes for this conn (so we can route responses back). */
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if (gsup_route_add_ipa_name(conn, &req->source_name.ipa_name)) {
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LOG_GSUP_REQ(req, LOGL_ERROR,
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"GSUP message received from %s via peer %s, but there already exists a"
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" different route to this source, message is not routable\n",
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osmo_cni_peer_id_to_str(&req->source_name),
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osmo_ipa_name_to_str(&conn->peer_name));
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osmo_gsup_req_respond_msgt(req, OSMO_GSUP_MSGT_ROUTING_ERROR, true);
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return NULL;
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}
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}
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return req;
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}
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static int osmo_gsup_conn_oap_handle(struct osmo_gsup_conn *conn,
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struct msgb *msg_rx)
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{
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#if 0
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int rc;
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struct msgb *msg_tx;
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rc = oap_handle(&conn->oap_state, msg_rx, &msg_tx);
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msgb_free(msg_rx);
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if (rc < 0)
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return rc;
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if (msg_tx)
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osmo_gsup_conn_send(conn, IPAC_PROTO_EXT_OAP, msg_tx);
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#endif
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return 0;
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}
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/* Data from a given client has arrived over the socket */
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static int osmo_gsup_server_read_cb(struct ipa_server_conn *conn,
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struct msgb *msg)
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{
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struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
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struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
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struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;
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int rc;
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msg->l2h = &hh->data[0];
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if (hh->proto == IPAC_PROTO_IPACCESS) {
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rc = ipa_server_conn_ccm(conn, msg);
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if (rc < 0) {
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/* conn is already invalid here! */
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return -1;
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}
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msgb_free(msg);
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return 0;
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}
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if (hh->proto != IPAC_PROTO_OSMO) {
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LOGP(DLGSUP, LOGL_NOTICE, "Unsupported IPA stream ID 0x%02x\n",
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hh->proto);
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goto invalid;
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}
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if (!he || msgb_l2len(msg) < sizeof(*he)) {
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LOGP(DLGSUP, LOGL_NOTICE, "short IPA message\n");
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goto invalid;
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}
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msg->l2h = &he->data[0];
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if (he->proto == IPAC_PROTO_EXT_GSUP) {
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OSMO_ASSERT(clnt->server->read_cb != NULL);
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clnt->server->read_cb(clnt, msg);
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/* expecting read_cb() to free msg */
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} else if (he->proto == IPAC_PROTO_EXT_OAP) {
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return osmo_gsup_conn_oap_handle(clnt, msg);
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/* osmo_gsup_client_oap_handle frees msg */
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} else {
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LOGP(DLGSUP, LOGL_NOTICE, "Unsupported IPA Osmo Proto 0x%02x\n",
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hh->proto);
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goto invalid;
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}
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return 0;
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invalid:
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LOGP(DLGSUP, LOGL_NOTICE,
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"GSUP received an invalid IPA message from %s:%d: %s\n",
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conn->addr, conn->port, osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)));
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msgb_free(msg);
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return -1;
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}
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static void osmo_tlvp_dump(const struct tlv_parsed *tlvp,
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int subsys, int level)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(tlvp->lv); i++) {
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if (!TLVP_PRESENT(tlvp, i))
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continue;
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LOGP(subsys, level, "%u: %s\n", i,
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TLVP_VAL(tlvp, i));
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LOGP(subsys, level, "%u: %s\n", i,
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osmo_hexdump(TLVP_VAL(tlvp, i),
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TLVP_LEN(tlvp, i)));
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}
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}
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/* FIXME: should this be parrt of ipas_server handling, not GSUP? */
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static void tlvp_copy(void *ctx, struct tlv_parsed *out, const struct tlv_parsed *in)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(out->lv); i++) {
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if (!TLVP_PRESENT(in, i)) {
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if (TLVP_PRESENT(out, i)) {
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talloc_free((void *) out->lv[i].val);
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out->lv[i].val = NULL;
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out->lv[i].len = 0;
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}
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continue;
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}
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out->lv[i].val = talloc_memdup(ctx, in->lv[i].val, in->lv[i].len);
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out->lv[i].len = in->lv[i].len;
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}
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}
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int osmo_gsup_conn_ccm_get(const struct osmo_gsup_conn *clnt, uint8_t **addr,
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uint8_t tag)
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{
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if (!TLVP_PRESENT(&clnt->ccm, tag))
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return -ENODEV;
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*addr = (uint8_t *) TLVP_VAL(&clnt->ccm, tag);
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return TLVP_LEN(&clnt->ccm, tag);
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}
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static int osmo_gsup_server_ccm_cb(struct ipa_server_conn *conn,
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struct msgb *msg, struct tlv_parsed *tlvp,
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struct ipaccess_unit *unit)
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{
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struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;
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uint8_t *addr = NULL;
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int addr_len;
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LOGP(DLGSUP, LOGL_INFO, "CCM Callback\n");
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/* FIXME: should this be parrt of ipas_server handling, not
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* GSUP? */
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tlvp_copy(clnt, &clnt->ccm, tlvp);
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osmo_tlvp_dump(tlvp, DLGSUP, LOGL_INFO);
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addr_len = osmo_gsup_conn_ccm_get(clnt, &addr, IPAC_IDTAG_SERNR);
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if (addr_len <= 0) {
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LOGP(DLGSUP, LOGL_ERROR, "GSUP client %s:%u has no %s IE and"
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" cannot be routed\n",
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conn->addr, conn->port,
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ipa_ccm_idtag_name(IPAC_IDTAG_SERNR));
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return -EINVAL;
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}
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osmo_ipa_name_set(&clnt->peer_name, addr, addr_len);
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gsup_route_add_ipa_name(clnt, &clnt->peer_name);
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return 0;
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}
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static void osmo_gsup_conn_free(struct osmo_gsup_conn *conn)
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{
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gsup_route_del_conn(conn);
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llist_del(&conn->list);
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talloc_free(conn);
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}
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static int osmo_gsup_server_closed_cb(struct ipa_server_conn *conn)
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{
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struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;
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LOGP(DLGSUP, LOGL_INFO, "Lost GSUP client %s:%d\n",
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conn->addr, conn->port);
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osmo_gsup_conn_free(clnt);
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return 0;
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}
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/* Add conn to the clients list in a way that conn->auc_3g_ind takes the lowest
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* unused integer and the list of clients remains sorted by auc_3g_ind.
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* Keep this function non-static to allow linking in a unit test. */
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void osmo_gsup_server_add_conn(struct llist_head *clients,
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struct osmo_gsup_conn *conn)
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{
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struct osmo_gsup_conn *c;
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struct osmo_gsup_conn *prev_conn;
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c = llist_first_entry_or_null(clients, struct osmo_gsup_conn, list);
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/* Is the first index, 0, unused? */
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if (!c || c->auc_3g_ind > 0) {
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conn->auc_3g_ind = 0;
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llist_add(&conn->list, clients);
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return;
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}
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/* Look for a gap later on */
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prev_conn = NULL;
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llist_for_each_entry(c, clients, list) {
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/* skip first item, we know it has auc_3g_ind == 0. */
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if (!prev_conn) {
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prev_conn = c;
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continue;
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}
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if (c->auc_3g_ind > prev_conn->auc_3g_ind + 1)
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break;
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prev_conn = c;
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}
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OSMO_ASSERT(prev_conn);
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conn->auc_3g_ind = prev_conn->auc_3g_ind + 1;
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llist_add(&conn->list, &prev_conn->list);
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}
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/* a client has connected to the server socket and we have accept()ed it */
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static int osmo_gsup_server_accept_cb(struct ipa_server_link *link, int fd)
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{
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struct osmo_gsup_conn *conn;
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struct osmo_gsup_server *gsups =
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(struct osmo_gsup_server *) link->data;
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int rc;
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conn = talloc_zero(gsups, struct osmo_gsup_conn);
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OSMO_ASSERT(conn);
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conn->conn = ipa_server_conn_create(gsups, link, fd,
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osmo_gsup_server_read_cb,
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osmo_gsup_server_closed_cb, conn);
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OSMO_ASSERT(conn->conn);
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conn->conn->ccm_cb = osmo_gsup_server_ccm_cb;
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/* link data structure with server structure */
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conn->server = gsups;
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osmo_gsup_server_add_conn(&gsups->clients, conn);
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LOGP(DLGSUP, LOGL_INFO, "New GSUP client %s:%d (IND=%u)\n",
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conn->conn->addr, conn->conn->port, conn->auc_3g_ind);
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/* request the identity of the client */
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rc = ipa_ccm_send_id_req(fd);
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if (rc < 0)
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goto failed;
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#if 0
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rc = oap_init(&gsups->oap_config, &conn->oap_state);
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if (rc != 0)
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goto failed;
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#endif
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return 0;
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failed:
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ipa_server_conn_destroy(conn->conn);
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return -1;
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}
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|
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struct osmo_gsup_server *
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osmo_gsup_server_create(void *ctx, const char *ip_addr, uint16_t tcp_port,
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osmo_gsup_read_cb_t read_cb, void *priv)
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{
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struct osmo_gsup_server *gsups;
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int rc;
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gsups = talloc_zero(ctx, struct osmo_gsup_server);
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OSMO_ASSERT(gsups);
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|
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INIT_LLIST_HEAD(&gsups->clients);
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INIT_LLIST_HEAD(&gsups->routes);
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|
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gsups->link = ipa_server_link_create(gsups,
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/* no e1inp */ NULL,
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ip_addr, tcp_port,
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osmo_gsup_server_accept_cb,
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gsups);
|
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if (!gsups->link)
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goto failed;
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|
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gsups->read_cb = read_cb;
|
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gsups->priv = priv;
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|
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rc = ipa_server_link_open(gsups->link);
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if (rc < 0)
|
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goto failed;
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return gsups;
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failed:
|
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osmo_gsup_server_destroy(gsups);
|
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return NULL;
|
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}
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|
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void osmo_gsup_server_destroy(struct osmo_gsup_server *gsups)
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{
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if (gsups->link) {
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ipa_server_link_close(gsups->link);
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ipa_server_link_destroy(gsups->link);
|
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gsups->link = NULL;
|
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}
|
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talloc_free(gsups);
|
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}
|
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|
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/* Set GSUP message's pdp_infos[0] to a wildcard APN.
|
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* Use the provided apn_buf to store the produced APN data. This must remain valid until
|
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* osmo_gsup_encode() is done. Return 0 if an entry was added, -ENOMEM if the provided buffer is too
|
|
* small. */
|
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int osmo_gsup_configure_wildcard_apn(struct osmo_gsup_message *gsup,
|
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uint8_t *apn_buf, size_t apn_buf_size)
|
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{
|
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int l;
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|
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l = osmo_apn_from_str(apn_buf, apn_buf_size, "*");
|
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if (l <= 0)
|
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return -ENOMEM;
|
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|
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gsup->pdp_infos[0].apn_enc = apn_buf;
|
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gsup->pdp_infos[0].apn_enc_len = l;
|
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gsup->pdp_infos[0].have_info = 1;
|
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gsup->num_pdp_infos = 1;
|
|
/* FIXME: use real value: */
|
|
gsup->pdp_infos[0].context_id = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Populate a gsup message structure with an Insert Subscriber Data Message.
|
|
* All required memory buffers for data pointed to by pointers in struct omso_gsup_message
|
|
* must be allocated by the caller and should have the same lifetime as the gsup parameter.
|
|
*
|
|
* \param[out] gsup The gsup message to populate.
|
|
* \param[in] imsi The subscriber's IMSI.
|
|
* \param[in] msisdn The subscriber's MSISDN.
|
|
* \param[out] msisdn_enc A buffer large enough to store the MSISDN in encoded form.
|
|
* \param[in] msisdn_enc_size Size of the buffer (must be >= OSMO_GSUP_MAX_CALLED_PARTY_BCD_LEN).
|
|
* \param[out] apn_buf A buffer large enough to store an APN (required if cn_domain is OSMO_GSUP_CN_DOMAIN_PS).
|
|
* \param[in] apn_buf_size Size of APN buffer (must be >= APN_MAXLEN).
|
|
* \param[in] cn_domain The CN Domain of the subscriber connection.
|
|
* \returns 0 on success, and negative on error.
|
|
*/
|
|
int osmo_gsup_create_insert_subscriber_data_msg(struct osmo_gsup_message *gsup, const char *imsi, const char *msisdn,
|
|
uint8_t *msisdn_enc, size_t msisdn_enc_size,
|
|
uint8_t *apn_buf, size_t apn_buf_size,
|
|
enum osmo_gsup_cn_domain cn_domain)
|
|
{
|
|
int len;
|
|
|
|
OSMO_ASSERT(gsup);
|
|
*gsup = (struct osmo_gsup_message){
|
|
.message_type = OSMO_GSUP_MSGT_INSERT_DATA_REQUEST,
|
|
};
|
|
|
|
osmo_strlcpy(gsup->imsi, imsi, sizeof(gsup->imsi));
|
|
|
|
if (msisdn_enc_size < OSMO_GSUP_MAX_CALLED_PARTY_BCD_LEN)
|
|
return -ENOSPC;
|
|
|
|
OSMO_ASSERT(msisdn_enc);
|
|
len = gsm48_encode_bcd_number(msisdn_enc, msisdn_enc_size, 0, msisdn);
|
|
if (len < 1) {
|
|
LOGP(DLGSUP, LOGL_ERROR, "%s: Error: cannot encode MSISDN '%s'\n", imsi, msisdn);
|
|
return -ENOSPC;
|
|
}
|
|
gsup->msisdn_enc = msisdn_enc;
|
|
gsup->msisdn_enc_len = len;
|
|
|
|
#pragma message "FIXME: deal with encoding the following data: gsup.hlr_enc"
|
|
|
|
gsup->cn_domain = cn_domain;
|
|
if (gsup->cn_domain == OSMO_GSUP_CN_DOMAIN_PS) {
|
|
OSMO_ASSERT(apn_buf_size >= APN_MAXLEN);
|
|
OSMO_ASSERT(apn_buf);
|
|
/* FIXME: PDP infos - use more fine-grained access control
|
|
instead of wildcard APN */
|
|
osmo_gsup_configure_wildcard_apn(gsup, apn_buf, apn_buf_size);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Populate a gsup message structure with a Location Cancel Message.
|
|
* All required memory buffers for data pointed to by pointers in struct omso_gsup_message
|
|
* must be allocated by the caller and should have the same lifetime as the gsup parameter.
|
|
*
|
|
* \param[out] gsup The gsup message to populate.
|
|
* \param[in] imsi The subscriber's IMSI.
|
|
* \param[in] cn_domain The CN Domain of the subscriber connection.
|
|
* \param[in] cancel_type The cancellation type.
|
|
*/
|
|
void osmo_gsup_create_location_cancel_msg(struct osmo_gsup_message *gsup, const char *imsi,
|
|
enum osmo_gsup_cn_domain cn_domain, enum osmo_gsup_cancel_type cancel_type)
|
|
{
|
|
OSMO_ASSERT(gsup);
|
|
*gsup = (struct osmo_gsup_message){
|
|
.message_type = OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST,
|
|
.cn_domain = cn_domain,
|
|
.cancel_type = cancel_type
|
|
};
|
|
|
|
osmo_strlcpy(gsup->imsi, imsi, sizeof(gsup->imsi));
|
|
}
|
|
|
|
int osmo_gsup_forward_to_local_peer(struct osmo_gsup_server *server, const struct osmo_cni_peer_id *to_peer,
|
|
struct osmo_gsup_req *req, struct osmo_gsup_message *modified_gsup)
|
|
{
|
|
int rc;
|
|
/* To forward to a remote entity (HLR, SMSC,...), we need to indicate the original source name in the Source
|
|
* Name IE to make sure the reply can be routed back. Store the sender in gsup->source_name -- the remote entity
|
|
* is required to return this as gsup->destination_name so that the reply gets routed to the original sender. */
|
|
struct osmo_gsup_message forward = *(modified_gsup? : &req->gsup);
|
|
|
|
if (req->source_name.type != OSMO_CNI_PEER_ID_IPA_NAME) {
|
|
osmo_gsup_req_respond_err(req, GMM_CAUSE_NET_FAIL, "Unsupported GSUP peer id type: %s",
|
|
osmo_cni_peer_id_type_name(req->source_name.type));
|
|
rc = -ENOTSUP;
|
|
goto routing_error;
|
|
}
|
|
forward.source_name = req->source_name.ipa_name.val;
|
|
forward.source_name_len = req->source_name.ipa_name.len;
|
|
|
|
if (to_peer->type != OSMO_CNI_PEER_ID_IPA_NAME) {
|
|
osmo_gsup_req_respond_err(req, GMM_CAUSE_NET_FAIL, "Unsupported GSUP peer id type: %s",
|
|
osmo_cni_peer_id_type_name(to_peer->type));
|
|
rc = -ENOTSUP;
|
|
goto routing_error;
|
|
}
|
|
LOG_GSUP_REQ(req, LOGL_INFO, "Forwarding to %s\n", osmo_cni_peer_id_to_str(to_peer));
|
|
rc = osmo_gsup_enc_send_to_ipa_name(server, &to_peer->ipa_name, &forward);
|
|
if (rc)
|
|
goto routing_error;
|
|
osmo_gsup_req_free(req);
|
|
return 0;
|
|
|
|
routing_error:
|
|
osmo_gsup_req_respond_msgt(req, OSMO_GSUP_MSGT_ROUTING_ERROR, true);
|
|
return rc;
|
|
}
|