588 lines
15 KiB
C
588 lines
15 KiB
C
/* Run M3UA over SCTP here */
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/* (C) 2015 by Holger Hans Peter Freyther
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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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#include <sctp_m3ua.h>
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#include <cellmgr_debug.h>
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#include <string.h>
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#include <bsc_data.h>
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#include <counter.h>
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#include <osmocom/sigtran/xua_msg.h>
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#include <osmocom/sigtran/m3ua_types.h>
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#include <osmocom/mtp/mtp_level3.h>
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#include <osmocom/core/talloc.h>
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#include <netinet/sctp.h>
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#include <unistd.h>
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#include <errno.h>
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#define SCTP_PPID_M3UA 3
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#define notImplemented() \
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LOGP(DINP, LOGL_NOTICE, "%s not implemented.\n", __func__)
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/*
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* State machine code
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*/
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static void m3ua_handle_aspsm(struct mtp_m3ua_client_link *link, struct xua_msg *msg);
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static void m3ua_handle_asptm(struct mtp_m3ua_client_link *link, struct xua_msg *msg);
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static void m3ua_handle_trans(struct mtp_m3ua_client_link *link, struct xua_msg *msg);
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static void m3ua_send_daud(struct mtp_m3ua_client_link *link, uint32_t pc);
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static void m3ua_send_aspup(struct mtp_m3ua_client_link *link);
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static void m3ua_send_aspac(struct mtp_m3ua_client_link *link);
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/*
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* boilerplate
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*/
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static int m3ua_shutdown(struct mtp_link *mtp_link);
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static void m3ua_start(void *data);
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static void schedule_restart(struct mtp_m3ua_client_link *link)
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{
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link->connect_timer.data = link;
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link->connect_timer.cb = m3ua_start;
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osmo_timer_schedule(&link->connect_timer, 1, 0);
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}
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static void fail_link(struct mtp_m3ua_client_link *link)
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{
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/* We need to fail the link */
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m3ua_shutdown(link->base);
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mtp_link_down(link->base);
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schedule_restart(link);
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}
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static void aspac_ack_timeout(void *data)
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{
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struct mtp_m3ua_client_link *link = data;
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LOGP(DINP, LOGL_ERROR, "ASP ACK not received. Closing it down.\n");
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fail_link(link);
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}
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static int m3ua_conn_handle(struct mtp_m3ua_client_link *link,
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struct msgb *msg, struct sctp_sndrcvinfo *info)
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{
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struct xua_msg *m3ua;
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m3ua = xua_from_msg(M3UA_VERSION, msg->len, msg->data);
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if (!m3ua) {
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LOGP(DINP, LOGL_ERROR, "Failed to parse the message.\n");
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return -1;
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}
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switch (m3ua->hdr.msg_class) {
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case M3UA_CLS_ASPSM:
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m3ua_handle_aspsm(link, m3ua);
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break;
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case M3UA_CLS_ASPTM:
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m3ua_handle_asptm(link, m3ua);
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break;
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case M3UA_CLS_TRANS:
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m3ua_handle_trans(link, m3ua);
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break;
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default:
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LOGP(DINP, LOGL_ERROR, "Unhandled msg_class %d\n",
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m3ua->hdr.msg_class);
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break;
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}
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xua_msg_free(m3ua);
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return 0;
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}
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static int m3ua_conn_write(struct osmo_fd *fd, struct msgb *msg)
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{
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int ret;
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struct sctp_sndrcvinfo info;
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memcpy(&info, msg->data, sizeof(info));
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ret = sctp_send(fd->fd, msg->l2h, msgb_l2len(msg),
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&info, 0);
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if (ret != msgb_l2len(msg))
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LOGP(DINP, LOGL_ERROR, "Failed to send %d.\n", ret);
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return 0;
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}
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static int m3ua_conn_send(struct mtp_m3ua_client_link *link,
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struct xua_msg *m3ua,
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struct sctp_sndrcvinfo *info)
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{
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struct msgb *msg;
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msg = xua_to_msg(M3UA_VERSION, m3ua);
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if (!msg)
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return -1;
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/* save the OOB data in front of the message */
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msg->l2h = msg->data;
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msgb_push(msg, sizeof(*info));
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memcpy(msg->data, info, sizeof(*info));
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if (osmo_wqueue_enqueue(&link->queue, msg) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to enqueue.\n");
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rate_ctr_inc(&link->base->ctrg->ctr[MTP_LNK_DRP]);
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rate_ctr_inc(&link->base->set->ctrg->ctr[MTP_LSET_TOTA_DRP_MSG]);
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msgb_free(msg);
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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 m3ua_conn_read(struct osmo_fd *fd)
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{
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struct sockaddr_in addr;
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struct sctp_sndrcvinfo info;
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socklen_t len = sizeof(addr);
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struct mtp_m3ua_client_link *link = fd->data;
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struct msgb *msg;
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int rc;
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msg = msgb_alloc(2048, "m3ua buffer");
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if (!msg) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate buffer.\n");
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fail_link(link);
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return -1;
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}
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memset(&info, 0, sizeof(info));
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memset(&addr, 0, sizeof(addr));
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rc = sctp_recvmsg(fd->fd, msg->data, msg->data_len,
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(struct sockaddr *) &addr, &len, &info, NULL);
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if (rc <= 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to read: %d errno: %d\n",
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rc, errno);
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msgb_free(msg);
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fail_link(link);
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return -1;
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}
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if (ntohl(info.sinfo_ppid) != SCTP_PPID_M3UA) {
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LOGP(DINP, LOGL_ERROR, "Only M3UA is allowed on this socket: %d\n",
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ntohl(info.sinfo_ppid));
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msgb_free(msg);
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return -1;
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}
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msgb_put(msg, rc);
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LOGP(DINP, LOGL_DEBUG, "Read %d on stream: %d ssn: %d assoc: %d\n",
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rc, info.sinfo_stream, info.sinfo_ssn, info.sinfo_assoc_id);
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m3ua_conn_handle(link, msg, &info);
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msgb_free(msg);
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return 0;
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}
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static void m3ua_start(void *data)
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{
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int sctp, ret;
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struct sockaddr_in loc_addr, rem_addr;
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struct mtp_m3ua_client_link *link = data;
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struct sctp_event_subscribe events;
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sctp = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP);
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if (!sctp) {
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LOGP(DINP, LOGL_ERROR, "Failed to create socket.\n");
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return fail_link(link);
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}
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memset(&events, 0, sizeof(events));
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events.sctp_data_io_event = 1;
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ret = setsockopt(sctp, SOL_SCTP, SCTP_EVENTS, &events, sizeof(events));
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if (ret != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to enable SCTP Events. Closing socket.\n");
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close(sctp);
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return fail_link(link);
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}
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loc_addr = link->local;
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loc_addr.sin_family = AF_INET;
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if (bind(sctp, (struct sockaddr *) &loc_addr, sizeof(loc_addr)) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to bind.\n");
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close(sctp);
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return fail_link(link);
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}
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rem_addr = link->remote;
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rem_addr.sin_family = AF_INET;
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if (connect(sctp, (struct sockaddr *) &rem_addr, sizeof(rem_addr)) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to connect\n");
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close(sctp);
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return fail_link(link);
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}
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link->queue.bfd.fd = sctp;
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link->queue.bfd.data = link;
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link->queue.bfd.when = BSC_FD_READ;
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link->queue.read_cb = m3ua_conn_read;
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link->queue.write_cb = m3ua_conn_write;
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if (osmo_fd_register(&link->queue.bfd) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to register fd\n");
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close(sctp);
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return fail_link(link);
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}
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/* begin the messages for bring-up */
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link->aspac_ack_timer.data = link;
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link->aspac_ack_timer.cb = aspac_ack_timeout;
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osmo_timer_schedule(&link->aspac_ack_timer, link->aspac_ack_timeout, 0);
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m3ua_send_aspup(link);
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}
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static int m3ua_write(struct mtp_link *mtp_link, struct msgb *msg)
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{
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struct mtp_m3ua_client_link *link = mtp_link->data;
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struct sctp_sndrcvinfo info;
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struct xua_msg *m3ua;
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struct mtp_level_3_hdr *mtp_hdr;
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struct m3ua_protocol_data proto_data;
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uint8_t *proto_start;
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if (!link->asptm_active) {
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LOGP(DINP, LOGL_ERROR, "ASP not ready for %d/%s of %d/%s.\n",
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mtp_link->nr, mtp_link->name, mtp_link->set->nr,
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mtp_link->set->name);
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goto clean;
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}
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/*
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* TODO.. we could enhance the structure of mtp_link to
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* have function pointers for operations like SLTM instead
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* of doing what we do here.
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* The entire m3ua episode (code + reading the spec) had a
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* budget of < 2 man days so the amount of architecture changes
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* we can do.
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*/
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/* TODO.. need to terminate MTPL3 locally... */
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/* TODO.. extract MTP information.. */
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mtp_hdr = (struct mtp_level_3_hdr *) msg->l2h;
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switch (mtp_hdr->ser_ind) {
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case MTP_SI_MNT_SNM_MSG:
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case MTP_SI_MNT_REG_MSG:
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LOGP(DINP, LOGL_ERROR,
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"Dropping SNM/REG message %d\n", mtp_hdr->ser_ind);
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goto clean;
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break;
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case MTP_SI_MNT_ISUP:
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case MTP_SI_MNT_SCCP:
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default:
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memset(&proto_data, 0, sizeof(proto_data));
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proto_data.opc = htonl(MTP_READ_OPC(mtp_hdr->addr));
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proto_data.dpc = htonl(MTP_READ_DPC(mtp_hdr->addr));
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proto_data.sls = MTP_LINK_SLS(mtp_hdr->addr);
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proto_data.si = mtp_hdr->ser_ind;
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proto_data.ni = mtp_link->set->ni;
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msg->l3h = mtp_hdr->data;
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msgb_pull_to_l3(msg);
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proto_start = msgb_push(msg, sizeof(proto_data));
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memcpy(proto_start, &proto_data, sizeof(proto_data));
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break;
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};
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m3ua = xua_msg_alloc();
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if (!m3ua)
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goto clean;
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mtp_handle_pcap(mtp_link, NET_OUT, msg->data, msg->len);
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m3ua->hdr.msg_class = M3UA_CLS_TRANS;
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m3ua->hdr.msg_type = M3UA_TRANS_DATA;
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/*
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* Modify the data...to create a true protocol data..
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*/
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xua_msg_add_data(m3ua, M3UA_TAG_PROTO_DATA, msg->len, msg->data);
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memset(&info, 0, sizeof(info));
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info.sinfo_stream = 1;
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info.sinfo_assoc_id = 1;
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info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
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m3ua_conn_send(link, m3ua, &info);
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xua_msg_free(m3ua);
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clean:
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msgb_free(msg);
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return 0;
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}
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static int m3ua_shutdown(struct mtp_link *mtp_link)
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{
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struct mtp_m3ua_client_link *link = mtp_link->data;
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if (link->queue.bfd.fd >= 0) {
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osmo_fd_unregister(&link->queue.bfd);
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close(link->queue.bfd.fd);
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link->queue.bfd.fd = -1;
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}
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osmo_wqueue_clear(&link->queue);
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link->aspsm_active = 0;
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link->asptm_active = 0;
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osmo_timer_del(&link->connect_timer);
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osmo_timer_del(&link->aspac_ack_timer);
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return 0;
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}
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static int m3ua_reset(struct mtp_link *mtp_link)
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{
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struct mtp_m3ua_client_link *link = mtp_link->data;
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/* stop things in case they run.. */
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m3ua_shutdown(mtp_link);
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schedule_restart(link);
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return 0;
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}
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static int m3ua_clear_queue(struct mtp_link *mtp_link)
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{
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struct mtp_m3ua_client_link *link = mtp_link->data;
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osmo_wqueue_clear(&link->queue);
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return 0;
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}
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struct mtp_m3ua_client_link *mtp_m3ua_client_link_init(struct mtp_link *blnk)
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{
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struct mtp_m3ua_client_link *lnk;
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lnk = talloc_zero(blnk, struct mtp_m3ua_client_link);
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if (!lnk) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate.\n");
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return NULL;
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}
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/* make sure we can resolve it both ways */
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lnk->base = blnk;
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blnk->data = lnk;
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blnk->type = SS7_LTYPE_M3UA_CLIENT;
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/* do some checks for lower layer handling */
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blnk->skip_link_test = 1;
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lnk->base->write = m3ua_write;
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lnk->base->shutdown = m3ua_shutdown;
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lnk->base->reset = m3ua_reset;
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lnk->base->clear_queue = m3ua_clear_queue;
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osmo_wqueue_init(&lnk->queue, 10);
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lnk->queue.bfd.fd = -1;
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lnk->traffic_mode = 2;
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lnk->aspac_ack_timeout = 10;
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return lnk;
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}
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/*
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* asp handling
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*/
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static void m3ua_send_aspup(struct mtp_m3ua_client_link *link)
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{
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struct sctp_sndrcvinfo info;
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struct xua_msg *aspup;
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uint32_t asp_ident;
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aspup = xua_msg_alloc();
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if (!aspup) {
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fail_link(link);
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return;
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}
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memset(&info, 0, sizeof(info));
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info.sinfo_stream = 0;
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info.sinfo_assoc_id = 1;
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info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
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aspup->hdr.msg_class = M3UA_CLS_ASPSM;
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aspup->hdr.msg_type = M3UA_ASPSM_UP;
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asp_ident = htonl(link->link_index);
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xua_msg_add_data(aspup, MUA_TAG_ASP_IDENT, 4, (uint8_t *) &asp_ident);
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m3ua_conn_send(link, aspup, &info);
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xua_msg_free(aspup);
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}
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static void m3ua_send_aspac(struct mtp_m3ua_client_link *link)
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{
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struct sctp_sndrcvinfo info;
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struct xua_msg *aspac;
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uint32_t routing_ctx;
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uint32_t traffic_mode;
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aspac = xua_msg_alloc();
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if (!aspac) {
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fail_link(link);
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return;
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}
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memset(&info, 0, sizeof(info));
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info.sinfo_stream = 0;
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info.sinfo_assoc_id = 1;
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info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
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aspac->hdr.msg_class = M3UA_CLS_ASPTM;
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aspac->hdr.msg_type = M3UA_ASPTM_ACTIV;
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traffic_mode = htonl(link->traffic_mode);
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xua_msg_add_data(aspac, 11, 4, (uint8_t *) &traffic_mode);
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routing_ctx = htonl(link->routing_context);
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xua_msg_add_data(aspac, MUA_TAG_ROUTING_CTX, 4, (uint8_t *) &routing_ctx);
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m3ua_conn_send(link, aspac, &info);
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xua_msg_free(aspac);
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}
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static void m3ua_send_daud(struct mtp_m3ua_client_link *link, uint32_t dpc)
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{
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struct sctp_sndrcvinfo info;
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struct xua_msg *daud;
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uint32_t routing_ctx;
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daud = xua_msg_alloc();
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if (!daud) {
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fail_link(link);
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return;
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}
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memset(&info, 0, sizeof(info));
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info.sinfo_stream = 0;
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info.sinfo_assoc_id = 1;
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info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
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daud->hdr.msg_class = M3UA_CLS_SSNM;
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daud->hdr.msg_type = M3UA_SSNM_DAUD;
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routing_ctx = htonl(link->routing_context);
|
|
xua_msg_add_data(daud, MUA_TAG_ROUTING_CTX, 4, (uint8_t *) &routing_ctx);
|
|
|
|
dpc = htonl(dpc);
|
|
xua_msg_add_data(daud, MUA_TAG_AFF_PC, 4, (uint8_t *) &dpc);
|
|
|
|
m3ua_conn_send(link, daud, &info);
|
|
xua_msg_free(daud);
|
|
}
|
|
|
|
static void m3ua_handle_aspsm(struct mtp_m3ua_client_link *link, struct xua_msg *m3ua)
|
|
{
|
|
switch (m3ua->hdr.msg_type) {
|
|
case M3UA_ASPSM_UP_ACK:
|
|
LOGP(DINP, LOGL_NOTICE, "Received ASP_UP_ACK.. sending ASPAC\n");
|
|
link->aspsm_active = 1;
|
|
m3ua_send_aspac(link);
|
|
break;
|
|
default:
|
|
LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
|
|
m3ua->hdr.msg_type);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void m3ua_handle_asptm(struct mtp_m3ua_client_link *link, struct xua_msg *m3ua)
|
|
{
|
|
switch (m3ua->hdr.msg_type) {
|
|
case M3UA_ASPTM_ACTIV_ACK:
|
|
LOGP(DINP, LOGL_NOTICE, "Received ASPAC_ACK.. taking link up\n");
|
|
osmo_timer_del(&link->aspac_ack_timer);
|
|
link->asptm_active = 1;
|
|
mtp_link_up(link->base);
|
|
m3ua_send_daud(link, link->base->set->dpc);
|
|
if (link->base->set->sccp_dpc != -1)
|
|
m3ua_send_daud(link, link->base->set->sccp_dpc);
|
|
break;
|
|
default:
|
|
LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
|
|
m3ua->hdr.msg_type);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void m3ua_handle_trans(struct mtp_m3ua_client_link *link, struct xua_msg *m3ua)
|
|
{
|
|
struct msgb *msg;
|
|
struct xua_msg_part *data;
|
|
struct mtp_link *mtp_link;
|
|
struct m3ua_protocol_data *proto;
|
|
struct mtp_level_3_hdr *mtp_hdr;
|
|
uint32_t opc, dpc;
|
|
uint8_t sls, si;
|
|
|
|
mtp_link = link->base;
|
|
|
|
/* ignore everything if the link is blocked */
|
|
if (mtp_link->blocked)
|
|
return;
|
|
|
|
if (m3ua->hdr.msg_type != M3UA_TRANS_DATA) {
|
|
LOGP(DINP, LOGL_ERROR, "msg_type(%d) is not known. Ignoring\n",
|
|
m3ua->hdr.msg_type);
|
|
return;
|
|
}
|
|
|
|
data = xua_msg_find_tag(m3ua, M3UA_TAG_PROTO_DATA);
|
|
if (!data) {
|
|
LOGP(DINP, LOGL_ERROR, "No PROTO_DATA in DATA message.\n");
|
|
return;
|
|
}
|
|
|
|
if (data->len > 2048) {
|
|
LOGP(DINP, LOGL_ERROR, "TOO much data for us to handle.\n");
|
|
return;
|
|
}
|
|
|
|
if (data->len < sizeof(struct m3ua_protocol_data)) {
|
|
LOGP(DINP, LOGL_ERROR, "Too little data..\n");
|
|
return;
|
|
}
|
|
|
|
msg = msgb_alloc(2048, "m3ua-data");
|
|
if (!msg) {
|
|
LOGP(DINP, LOGL_ERROR, "Failed to allocate storage.\n");
|
|
return;
|
|
}
|
|
|
|
msg->l2h = msgb_put(msg, data->len);
|
|
memcpy(msg->l2h, data->dat, data->len);
|
|
|
|
proto = (struct m3ua_protocol_data *) msg->l2h;
|
|
opc = ntohl(proto->opc);
|
|
dpc = ntohl(proto->dpc);
|
|
sls = proto->sls;
|
|
si = proto->si;
|
|
LOGP(DINP, LOGL_DEBUG, "Got data for OPC(%d)/DPC(%d)/SLS(%d) len(%d)\n",
|
|
opc, dpc, sls, msgb_l2len(msg) - sizeof(*proto));
|
|
|
|
|
|
/* put a MTP3 header in front */
|
|
msg->l3h = proto->data;
|
|
msgb_pull_to_l3(msg);
|
|
msg->l2h = msgb_push(msg, sizeof(*mtp_hdr));
|
|
mtp_hdr = (struct mtp_level_3_hdr *) msg->l2h;
|
|
mtp_hdr->ser_ind = si;
|
|
mtp_hdr->addr = MTP_ADDR(sls % 16, dpc, opc);
|
|
|
|
mtp_handle_pcap(mtp_link, NET_IN, msg->l2h, msgb_l2len(msg));
|
|
mtp_link_set_data(mtp_link, msg);
|
|
msgb_free(msg);
|
|
}
|