633 lines
15 KiB
C
633 lines
15 KiB
C
/* MSC related stuff... */
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/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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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 <bsc_data.h>
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#include <bsc_ussd.h>
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#include <bss_patch.h>
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#include <bssap_sccp.h>
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#include <ipaccess.h>
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#include <mtp_data.h>
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#include <cellmgr_debug.h>
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#include <osmocore/tlv.h>
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#include <osmocore/utils.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#define RECONNECT_TIME 10, 0
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#define NAT_MUX 0xfc
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static void msc_send_id_response(struct bsc_data *bsc);
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static void msc_send(struct bsc_data *bsc, struct msgb *msg, int proto);
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static void msc_schedule_reconnect(struct bsc_data *bsc);
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void mtp_link_slta_recv(struct mtp_link *link)
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{
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struct msgb *msg;
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unsigned int sls;
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while (!llist_empty(&link->pending_msgs)) {
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msg = msgb_dequeue(&link->pending_msgs);
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sls = (unsigned int) msg->l3h;
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if (mtp_link_submit_sccp_data(link, sls, msg->l2h, msgb_l2len(msg)) != 0)
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LOGP(DMSC, LOGL_ERROR, "Could not forward SCCP message.\n");
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msgb_free(msg);
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}
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}
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int send_or_queue_bsc_msg(struct mtp_link *link, int sls, struct msgb *msg)
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{
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if (link->sltm_pending) {
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LOGP(DMSC, LOGL_NOTICE, "Queueing msg for pending SLTM.\n");
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msg->l3h = (uint8_t *) sls;
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msgb_enqueue(&link->pending_msgs, msg);
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return 1;
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}
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if (mtp_link_submit_sccp_data(link, sls, msg->l2h, msgb_l2len(msg)) != 0)
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LOGP(DMSC, LOGL_ERROR, "Could not forward SCCP message.\n");
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return 0;
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}
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void msc_clear_queue(struct bsc_data *data)
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{
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struct msgb *msg;
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LOGP(DMSC, LOGL_NOTICE, "Clearing the MSC to BSC queue.\n");
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while (!llist_empty(&data->link.the_link->pending_msgs)) {
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msg = msgb_dequeue(&data->link.the_link->pending_msgs);
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msgb_free(msg);
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}
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}
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void msc_close_connection(struct bsc_data *bsc)
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{
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struct bsc_fd *bfd = &bsc->msc_connection.bfd;
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close(bfd->fd);
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bsc_unregister_fd(bfd);
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bfd->fd = -1;
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bsc->msc_link_down = 1;
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release_bsc_resources(bsc);
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bsc_del_timer(&bsc->ping_timeout);
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bsc_del_timer(&bsc->pong_timeout);
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bsc_del_timer(&bsc->msc_timeout);
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msc_schedule_reconnect(bsc);
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}
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static void msc_connect_timeout(void *_bsc_data)
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{
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struct bsc_data *bsc_data = _bsc_data;
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LOGP(DMSC, LOGL_ERROR, "Timeout on the MSC connection.\n");
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msc_close_connection(bsc_data);
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}
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static void msc_pong_timeout(void *_bsc_data)
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{
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struct bsc_data *bsc_data = _bsc_data;
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LOGP(DMSC, LOGL_ERROR, "MSC didn't respond to ping. Closing.\n");
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msc_close_connection(bsc_data);
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}
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static void send_ping(struct bsc_data *bsc)
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{
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struct msgb *msg;
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msg = msgb_alloc_headroom(4096, 128, "ping");
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if (!msg) {
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LOGP(DMSC, LOGL_ERROR, "Failed to create PING.\n");
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return;
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}
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msg->l2h = msgb_put(msg, 1);
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msg->l2h[0] = IPAC_MSGT_PING;
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msc_send(bsc, msg, IPAC_PROTO_IPACCESS);
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}
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static void msc_ping_timeout(void *_bsc_data)
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{
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struct bsc_data *bsc_data = _bsc_data;
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if (bsc_data->ping_time < 0)
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return;
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send_ping(bsc_data);
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/* send another ping in 20 seconds */
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bsc_schedule_timer(&bsc_data->ping_timeout, bsc_data->ping_time, 0);
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/* also start a pong timer */
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bsc_schedule_timer(&bsc_data->pong_timeout, bsc_data->pong_time, 0);
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}
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/*
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* callback with IP access data
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*/
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static int ipaccess_a_fd_cb(struct bsc_fd *bfd)
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{
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int error;
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struct ipaccess_head *hh;
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struct mtp_link *link;
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struct bsc_data *bsc;
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struct msgb *msg;
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msg = ipaccess_read_msg(bfd, &error);
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bsc = (struct bsc_data *) bfd->data;
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if (!msg) {
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if (error == 0)
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fprintf(stderr, "The connection to the MSC was lost, exiting\n");
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else
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fprintf(stderr, "Error in the IPA stream.\n");
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msc_close_connection(bsc);
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return -1;
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}
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LOGP(DMSC, LOGL_DEBUG, "From MSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]);
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/* handle base message handling */
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hh = (struct ipaccess_head *) msg->data;
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ipaccess_rcvmsg_base(msg, bfd);
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link = bsc->link.the_link;
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/* initialize the networking. This includes sending a GSM08.08 message */
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if (hh->proto == IPAC_PROTO_IPACCESS) {
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if (bsc->first_contact) {
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LOGP(DMSC, LOGL_NOTICE, "Connected to MSC. Sending reset.\n");
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bsc_del_timer(&bsc->msc_timeout);
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bsc->first_contact = 0;
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bsc->msc_link_down = 0;
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msc_send_reset(bsc);
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}
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if (msg->l2h[0] == IPAC_MSGT_ID_GET && bsc->token) {
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msc_send_id_response(bsc);
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} else if (msg->l2h[0] == IPAC_MSGT_PONG) {
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bsc_del_timer(&bsc->pong_timeout);
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}
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} else if (hh->proto == IPAC_PROTO_SCCP) {
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struct sccp_parse_result result;
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int rc;
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/* we can not forward it right now */
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if (bsc->forward_only && link->sccp_up) {
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if (send_or_queue_bsc_msg(link, 13, msg) != 1)
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msgb_free(msg);
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return 0;
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}
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rc = bss_patch_filter_msg(msg, &result);
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if (rc == BSS_FILTER_RESET_ACK) {
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LOGP(DMSC, LOGL_NOTICE, "Filtering reset ack from the MSC\n");
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} else if (rc == BSS_FILTER_RLSD) {
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LOGP(DMSC, LOGL_DEBUG, "Filtering RLSD from the MSC\n");
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update_con_state(NULL, rc, &result, msg, 1, 0);
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} else if (rc == BSS_FILTER_RLC) {
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/* if we receive this we have forwarded a RLSD to the network */
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LOGP(DMSC, LOGL_ERROR, "RLC from the network. BAD!\n");
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} else if (rc == BSS_FILTER_CLEAR_COMPL) {
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LOGP(DMSC, LOGL_ERROR, "Clear Complete from the network.\n");
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} else if (link->sccp_up) {
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unsigned int sls;
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update_con_state(NULL, rc, &result, msg, 1, 0);
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sls = sls_for_src_ref(result.destination_local_reference);
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/* Check for Location Update Accept */
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bsc_ussd_handle_in_msg(bsc, &result, msg);
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/* patch a possible PC */
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bss_rewrite_header_to_bsc(msg, link->opc, link->dpc);
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/* we can not forward it right now */
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if (send_or_queue_bsc_msg(link, sls, msg) == 1)
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return 0;
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}
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} else if (hh->proto == NAT_MUX) {
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mgcp_forward(bsc, msg->l2h, msgb_l2len(msg));
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} else {
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LOGP(DMSC, LOGL_ERROR, "Unknown IPA proto 0x%x\n", hh->proto);
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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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static int ipaccess_write_cb(struct bsc_fd *fd, struct msgb *msg)
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{
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int rc;
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LOGP(DMSC, LOGL_DEBUG, "Sending to MSC: %s\n", hexdump(msg->data, msg->len));
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rc = write(fd->fd, msg->data, msg->len);
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if (rc != msg->len)
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LOGP(DMSC, LOGL_ERROR, "Could not write to MSC.\n");
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return rc;
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}
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/* called in the case of a non blocking connect */
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static int msc_connection_connect(struct bsc_fd *fd, unsigned int what)
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{
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int rc;
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int val;
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socklen_t len = sizeof(val);
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struct bsc_data *bsc;
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bsc = (struct bsc_data *) fd->data;
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if (fd != &bsc->msc_connection.bfd) {
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LOGP(DMSC, LOGL_ERROR, "This is only working with the MSC connection.\n");
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return -1;
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}
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if ((what & BSC_FD_WRITE) == 0)
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return -1;
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/* check the socket state */
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rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len);
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if (rc != 0) {
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LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n");
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goto error;
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}
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if (val != 0) {
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LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC.\n");
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goto error;
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}
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/* go to full operation */
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fd->cb = write_queue_bfd_cb;
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fd->when = BSC_FD_READ;
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if (!llist_empty(&bsc->msc_connection.msg_queue))
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fd->when |= BSC_FD_WRITE;
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return 0;
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error:
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msc_close_connection(bsc);
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return -1;
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}
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static int setnonblocking(struct bsc_fd *fd)
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{
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int flags;
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flags = fcntl(fd->fd, F_GETFL);
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if (flags < 0) {
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perror("fcntl get failed");
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close(fd->fd);
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fd->fd = -1;
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return -1;
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}
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flags |= O_NONBLOCK;
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flags = fcntl(fd->fd, F_SETFL, flags);
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if (flags < 0) {
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perror("fcntl get failed");
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close(fd->fd);
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fd->fd = -1;
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return -1;
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}
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return 0;
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}
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static int connect_to_msc(struct bsc_fd *fd, const char *ip, int port, int tos)
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{
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struct sockaddr_in sin;
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int on = 1, ret;
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LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", ip, port);
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fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (fd->fd < 0) {
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perror("Creating TCP socket failed");
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return fd->fd;
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}
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/* make it non blocking */
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if (setnonblocking(fd) != 0)
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return -1;
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_port = htons(port);
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inet_aton(ip, &sin.sin_addr);
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setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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ret = setsockopt(fd->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
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if (ret != 0)
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LOGP(DMSC, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno));
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ret = setsockopt(fd->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
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if (ret != 0)
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LOGP(DMSC, LOGL_ERROR, "Failed to set IP_TOS: %s\n", strerror(errno));
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ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin));
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if (ret == -1 && errno == EINPROGRESS) {
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LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n");
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fd->when = BSC_FD_WRITE;
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fd->cb = msc_connection_connect;
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} else if (ret < 0) {
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perror("Connection failed");
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close(fd->fd);
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fd->fd = -1;
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return ret;
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} else {
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fd->when = BSC_FD_READ;
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fd->cb = write_queue_bfd_cb;
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}
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ret = bsc_register_fd(fd);
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if (ret < 0) {
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perror("Registering the fd failed");
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close(fd->fd);
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fd->fd = -1;
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return ret;
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}
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return ret;
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}
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static void msc_reconnect(void *_data)
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{
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int rc;
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struct bsc_data *bsc = (struct bsc_data *) _data;
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bsc_del_timer(&bsc->reconnect_timer);
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bsc->first_contact = 1;
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rc = connect_to_msc(&bsc->msc_connection.bfd, bsc->msc_address, 5000, bsc->msc_ip_dscp);
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if (rc < 0) {
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fprintf(stderr, "Opening the MSC connection failed. Trying again\n");
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bsc_schedule_timer(&bsc->reconnect_timer, RECONNECT_TIME);
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return;
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}
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bsc->msc_timeout.cb = msc_connect_timeout;
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bsc->msc_timeout.data = bsc;
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bsc_schedule_timer(&bsc->msc_timeout, bsc->msc_time, 0);
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}
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static void msc_schedule_reconnect(struct bsc_data *bsc)
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{
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bsc_schedule_timer(&bsc->reconnect_timer, RECONNECT_TIME);
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}
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/*
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* mgcp forwarding is below
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*/
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static int mgcp_do_write(struct bsc_fd *fd, struct msgb *msg)
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{
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int ret;
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LOGP(DMGCP, LOGL_DEBUG, "Sending msg to MGCP GW size: %u\n", msg->len);
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ret = write(fd->fd, msg->data, msg->len);
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if (ret != msg->len)
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LOGP(DMGCP, LOGL_ERROR, "Failed to forward message to MGCP GW (%s).\n", strerror(errno));
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return ret;
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}
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static int mgcp_do_read(struct bsc_fd *fd)
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{
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struct msgb *mgcp;
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int ret;
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mgcp = msgb_alloc_headroom(4096, 128, "mgcp_from_gw");
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if (!mgcp) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n");
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return -1;
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}
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ret = read(fd->fd, mgcp->data, 4096 - 128);
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if (ret <= 0) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to read: %d/%s\n", errno, strerror(errno));
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msgb_free(mgcp);
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return -1;
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} else if (ret > 4096 - 128) {
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LOGP(DMGCP, LOGL_ERROR, "Too much data: %d\n", ret);
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msgb_free(mgcp);
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return -1;
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}
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mgcp->l2h = msgb_put(mgcp, ret);
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msc_send(fd->data, mgcp, NAT_MUX);
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return 0;
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}
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void mgcp_forward(struct bsc_data *bsc, const uint8_t *data, unsigned int length)
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{
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struct msgb *mgcp;
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if (length > 4096) {
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LOGP(DMGCP, LOGL_ERROR, "Can not forward too big message.\n");
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return;
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}
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mgcp = msgb_alloc(4096, "mgcp_to_gw");
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if (!mgcp) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to send message.\n");
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return;
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}
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msgb_put(mgcp, length);
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memcpy(mgcp->data, data, mgcp->len);
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if (write_queue_enqueue(&bsc->mgcp_agent, mgcp) != 0) {
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LOGP(DMGCP, LOGL_FATAL, "Could not queue message to MGCP GW.\n");
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msgb_free(mgcp);
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}
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}
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static int mgcp_create_port(struct bsc_data *bsc)
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{
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int on;
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struct sockaddr_in addr;
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bsc->mgcp_agent.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (bsc->mgcp_agent.bfd.fd < 0) {
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LOGP(DMGCP, LOGL_FATAL, "Failed to create UDP socket errno: %d\n", errno);
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return -1;
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}
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on = 1;
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setsockopt(bsc->mgcp_agent.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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/* try to bind the socket */
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
|
addr.sin_port = 0;
|
|
|
|
if (bind(bsc->mgcp_agent.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
|
|
LOGP(DMGCP, LOGL_FATAL, "Failed to bind to any port.\n");
|
|
close(bsc->mgcp_agent.bfd.fd);
|
|
bsc->mgcp_agent.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
/* connect to the remote */
|
|
addr.sin_port = htons(2427);
|
|
if (connect(bsc->mgcp_agent.bfd.fd, (struct sockaddr *) & addr, sizeof(addr)) < 0) {
|
|
LOGP(DMGCP, LOGL_FATAL, "Failed to connect to local MGCP GW. %s\n", strerror(errno));
|
|
close(bsc->mgcp_agent.bfd.fd);
|
|
bsc->mgcp_agent.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
write_queue_init(&bsc->mgcp_agent, 10);
|
|
bsc->mgcp_agent.bfd.data = bsc;
|
|
bsc->mgcp_agent.bfd.when = BSC_FD_READ;
|
|
bsc->mgcp_agent.read_cb = mgcp_do_read;
|
|
bsc->mgcp_agent.write_cb = mgcp_do_write;
|
|
|
|
if (bsc_register_fd(&bsc->mgcp_agent.bfd) != 0) {
|
|
LOGP(DMGCP, LOGL_FATAL, "Failed to register BFD\n");
|
|
close(bsc->mgcp_agent.bfd.fd);
|
|
bsc->mgcp_agent.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int msc_init(struct bsc_data *bsc, int mgcp)
|
|
{
|
|
write_queue_init(&bsc->msc_connection, 100);
|
|
bsc->reconnect_timer.cb = msc_reconnect;
|
|
bsc->reconnect_timer.data = bsc;
|
|
bsc->msc_connection.read_cb = ipaccess_a_fd_cb;
|
|
bsc->msc_connection.write_cb = ipaccess_write_cb;
|
|
bsc->msc_connection.bfd.data = bsc;
|
|
bsc->msc_link_down = 1;
|
|
|
|
/* handle the timeout */
|
|
bsc->ping_timeout.cb = msc_ping_timeout;
|
|
bsc->ping_timeout.data = bsc;
|
|
bsc->pong_timeout.cb = msc_pong_timeout;
|
|
bsc->pong_timeout.data = bsc;
|
|
|
|
/* create MGCP port */
|
|
if (mgcp && mgcp_create_port(bsc) != 0)
|
|
return -1;
|
|
|
|
/* now connect to the BSC */
|
|
msc_schedule_reconnect(bsc);
|
|
return 0;
|
|
}
|
|
|
|
static void msc_send(struct bsc_data *bsc, struct msgb *msg, int proto)
|
|
{
|
|
if (bsc->msc_link_down) {
|
|
LOGP(DMSC, LOGL_NOTICE, "Dropping data due lack of MSC connection.\n");
|
|
msgb_free(msg);
|
|
return;
|
|
}
|
|
|
|
ipaccess_prepend_header(msg, proto);
|
|
|
|
if (write_queue_enqueue(&bsc->msc_connection, msg) != 0) {
|
|
LOGP(DMSC, LOGL_FATAL, "Failed to queue MSG for the MSC.\n");
|
|
msgb_free(msg);
|
|
return;
|
|
}
|
|
}
|
|
|
|
void msc_send_rlc(struct bsc_data *bsc,
|
|
struct sccp_source_reference *src, struct sccp_source_reference *dst)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
msg = create_sccp_rlc(src, dst);
|
|
if (!msg)
|
|
return;
|
|
|
|
msc_send(bsc, msg, IPAC_PROTO_SCCP);
|
|
}
|
|
|
|
void msc_send_reset(struct bsc_data *bsc)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
msg = create_reset();
|
|
if (!msg)
|
|
return;
|
|
|
|
msc_send(bsc, msg, IPAC_PROTO_SCCP);
|
|
msc_ping_timeout(bsc);
|
|
}
|
|
|
|
static void msc_send_id_response(struct bsc_data *bsc)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
msg = msgb_alloc_headroom(4096, 128, "id resp");
|
|
msg->l2h = msgb_v_put(msg, IPAC_MSGT_ID_RESP);
|
|
msgb_l16tv_put(msg, strlen(bsc->token) + 1,
|
|
IPAC_IDTAG_UNITNAME, (uint8_t *) bsc->token);
|
|
|
|
msc_send(bsc, msg, IPAC_PROTO_IPACCESS);
|
|
}
|
|
|
|
void msc_send_direct(struct bsc_data *bsc, struct msgb *msg)
|
|
{
|
|
return msc_send(bsc, msg, IPAC_PROTO_SCCP);
|
|
}
|
|
|
|
void msc_send_msg(struct bsc_data *bsc, int rc, struct sccp_parse_result *result, struct msgb *_msg)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
if (bsc->msc_connection.bfd.fd < 0) {
|
|
LOGP(DMSC, LOGL_ERROR, "No connection to the MSC. dropping\n");
|
|
return;
|
|
}
|
|
|
|
bsc_ussd_handle_out_msg(bsc, result, _msg);
|
|
|
|
msg = msgb_alloc_headroom(4096, 128, "SCCP to MSC");
|
|
if (!msg) {
|
|
LOGP(DMSC, LOGL_ERROR, "Failed to alloc MSC msg.\n");
|
|
return;
|
|
}
|
|
|
|
bss_rewrite_header_for_msc(rc, msg, _msg, result);
|
|
msc_send(bsc, msg, IPAC_PROTO_SCCP);
|
|
}
|