m2ua: Create a MTP Link class using SCTP/M2UA for the transport
This is a MTP Link that can be used with a MTP LinkSet. E.g. with
some config changes one could use cellmgr_ng or udt_relay over a
M2UA link.
diff --git a/configure.ac b/configure.ac
index dd2b04a..7651309 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,8 @@
PKG_CHECK_MODULES([LIBOSMOVTY], [libosmovty])
#PKG_CHECK_MODULES([NEXUSWARE_C7], [nexusware-c7])
+AC_CHECK_LIB([sctp], sctp_sendmsg, [], [AC_MSG_ERROR([The sctp library is required.])])
+
AC_ARG_ENABLE([uniporte], [AS_HELP_STRING([--enable-uniporte], [Build with uniporte])],
[
PKG_CHECK_MODULES([NEXUSWARE_UNIPORTE], [nexusware-uniporte])
diff --git a/include/Makefile.am b/include/Makefile.am
index a0a54b9..6771b84 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,5 +1,5 @@
noinst_HEADERS = mtp_level3.h mtp_data.h ipaccess.h thread.h mtp_pcap.h \
mgcp_ss7.h bss_patch.h bssap_sccp.h bsc_data.h udp_input.h \
- snmp_mtp.h cellmgr_debug.h bsc_sccp.h bsc_ussd.h
+ snmp_mtp.h cellmgr_debug.h bsc_sccp.h bsc_ussd.h sctp_m2ua.h
SUBDIRS = mgcp
diff --git a/include/sctp_m2ua.h b/include/sctp_m2ua.h
new file mode 100644
index 0000000..2627d7d
--- /dev/null
+++ b/include/sctp_m2ua.h
@@ -0,0 +1,60 @@
+/* Run M2UA over SCTP here */
+/* (C) 2011 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef sctp_m2ua_h
+#define sctp_m2ua_h
+
+#include "mtp_data.h"
+
+#include <osmocom/m2ua/m2ua_msg.h>
+#include <osmocore/write_queue.h>
+
+#include <netinet/in.h>
+#include <netinet/sctp.h>
+
+struct sctp_m2ua_conn;
+struct mtp_link;
+
+/**
+ * Drive M2UA over a SCTP link. Right now we have no
+ * real concept for failover and such for the link.
+ */
+struct mtp_m2ua_link {
+ struct mtp_link base;
+
+ int started;
+ struct llist_head conns;
+ struct bsc_fd bsc;
+};
+
+/*
+ * One ASP that can be active or such.
+ */
+struct sctp_m2ua_conn {
+ struct llist_head entry;
+ uint8_t asp_ident[4];
+ int asp_up;
+ int asp_active;
+ int established;
+
+ struct write_queue queue;
+ struct mtp_m2ua_link *trans;
+};
+
+struct mtp_m2ua_link *sctp_m2ua_transp_create(const char *ip, int port);
+
+#endif
diff --git a/src/Makefile.am b/src/Makefile.am
index 83acf8d..0331406 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -17,6 +17,6 @@
udt_relay_SOURCES = main_udt.c mtp_layer3.c thread.c input/ipaccess.c pcap.c \
msc_conn.c link_udp.c snmp_mtp.c debug.c vty_interface.c \
- bss_patch.c isup.c links.c
+ bss_patch.c isup.c links.c sctp_m2ua.c
udt_relay_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) $(NEXUSWARE_C7_LIBS) \
- -lpthread -lnetsnmp -lcrypto
+ -lpthread -lnetsnmp -lcrypto -lm2ua -lsctp
diff --git a/src/sctp_m2ua.c b/src/sctp_m2ua.c
new file mode 100644
index 0000000..2ae7316
--- /dev/null
+++ b/src/sctp_m2ua.c
@@ -0,0 +1,631 @@
+/* Run M2UA over SCTP here */
+/* (C) 2011 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <sctp_m2ua.h>
+#include <bsc_data.h>
+#include <cellmgr_debug.h>
+#include <mtp_data.h>
+
+#include <osmocore/talloc.h>
+
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <string.h>
+#include <unistd.h>
+
+extern struct bsc_data bsc;
+
+static void m2ua_conn_destroy(struct sctp_m2ua_conn *conn)
+{
+ close(conn->queue.bfd.fd);
+ bsc_unregister_fd(&conn->queue.bfd);
+ write_queue_clear(&conn->queue);
+ llist_del(&conn->entry);
+
+ if (conn->asp_up && conn->asp_active && conn->established)
+ mtp_link_down(&conn->trans->base);
+ talloc_free(conn);
+
+ #warning "Notify any other AS(P) for failover scenario"
+}
+
+static int m2ua_conn_send(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct msgb *msg;
+ msg = m2ua_to_msg(m2ua);
+ if (!msg)
+ return -1;
+
+ /* save the OOB data in front of the message */
+ msg->l2h = msg->data;
+ msgb_push(msg, sizeof(*info));
+ memcpy(msg->data, info, sizeof(*info));
+
+ if (write_queue_enqueue(&conn->queue, msg) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to enqueue.\n");
+ msgb_free(msg);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int m2ua_conn_send_ntfy(struct sctp_m2ua_conn *conn,
+ struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg *msg;
+ uint16_t state[2];
+ int rc;
+
+ msg = m2ua_msg_alloc();
+ if (!msg)
+ return -1;
+ msg->hdr.msg_class = M2UA_CLS_MGMT;
+ msg->hdr.msg_type = M2UA_MGMT_NTFY;
+
+ /* state change */
+ state[0] = ntohs(M2UA_STP_AS_STATE_CHG);
+
+ if (conn->asp_active)
+ state[1] = ntohs(M2UA_STP_AS_ACTIVE);
+ else
+ state[1] = ntohs(M2UA_STP_AS_INACTIVE);
+
+ m2ua_msg_add_data(msg, MUA_TAG_STATUS, 4, (uint8_t *) state);
+ m2ua_msg_add_data(msg, MUA_TAG_ASP_IDENT, 4, conn->asp_ident);
+ rc = m2ua_conn_send(conn, msg, info);
+ m2ua_msg_free(msg);
+
+ return rc;
+}
+
+static int m2ua_handle_asp_ack(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg_part *asp_ident;
+ struct m2ua_msg *ack;
+
+ asp_ident = m2ua_msg_find_tag(m2ua, MUA_TAG_ASP_IDENT);
+ if (!asp_ident) {
+ LOGP(DINP, LOGL_ERROR, "ASP UP lacks ASP IDENT\n");
+ return -1;
+ }
+ if (asp_ident->len != 4) {
+ LOGP(DINP, LOGL_ERROR, "ASP Ident needs to be four byte.\n");
+ return -1;
+ }
+
+ /* TODO: Better handling for fail over is needed here */
+ ack = m2ua_msg_alloc();
+ if (!ack) {
+ LOGP(DINP, LOGL_ERROR, "Failed to create response\n");
+ return -1;
+ }
+
+ ack->hdr.msg_class = M2UA_CLS_ASPSM;
+ ack->hdr.msg_type = M2UA_ASPSM_UP_ACK;
+ if (m2ua_conn_send(conn, ack, info) != 0) {
+ m2ua_msg_free(ack);
+ return -1;
+ }
+
+ memcpy(conn->asp_ident, asp_ident->dat, 4);
+ conn->asp_up = 1;
+
+ m2ua_conn_send_ntfy(conn, info);
+ m2ua_msg_free(ack);
+ return 0;
+}
+
+static int m2ua_handle_asp(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua, struct sctp_sndrcvinfo *info)
+{
+ switch (m2ua->hdr.msg_type) {
+ case M2UA_ASPSM_UP:
+ m2ua_handle_asp_ack(conn, m2ua, info);
+ break;
+ default:
+ LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
+ m2ua->hdr.msg_type);
+ break;
+ }
+
+ return 0;
+}
+
+static int m2ua_handle_asptm_act(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg *ack;
+
+ /* TODO: parse the interface identifiers. This is plural */
+ ack = m2ua_msg_alloc();
+ if (!ack)
+ return -1;
+
+ ack->hdr.msg_class = M2UA_CLS_ASPTM;
+ ack->hdr.msg_type = M2UA_ASPTM_ACTIV_ACK;
+
+ if (m2ua_conn_send(conn, ack, info) != 0) {
+ m2ua_msg_free(ack);
+ return -1;
+ }
+
+ conn->asp_active = 1;
+ m2ua_conn_send_ntfy(conn, info);
+ m2ua_msg_free(ack);
+ return 0;
+}
+
+static int m2ua_handle_asptm(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ switch (m2ua->hdr.msg_type) {
+ case M2UA_ASPTM_ACTIV:
+ m2ua_handle_asptm_act(conn, m2ua, info);
+ break;
+ default:
+ LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
+ m2ua->hdr.msg_type);
+ break;
+ }
+
+ return 0;
+}
+
+static int m2ua_handle_state_req(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg_part *ident, *state;
+ struct m2ua_msg *conf;
+ int interface = 0, req;
+
+ state = m2ua_msg_find_tag(m2ua, M2UA_TAG_STATE_REQ);
+ if (!state || state->len != 4) {
+ LOGP(DINP, LOGL_ERROR, "Mandantory state request not present.\n");
+ return -1;
+ }
+
+ ident = m2ua_msg_find_tag(m2ua, MUA_TAG_IDENT_INT);
+ if (ident && ident->len == 4) {
+ memcpy(&interface, ident->dat, 4);
+ interface = ntohl(interface);
+ }
+
+ memcpy(&req, state->dat, 4);
+ req = ntohl(req);
+
+ switch (req) {
+ case M2UA_STATUS_EMER_SET:
+ conf = m2ua_msg_alloc();
+ if (!conf)
+ return -1;
+
+ conf->hdr.msg_class = M2UA_CLS_MAUP;
+ conf->hdr.msg_type = M2UA_MAUP_STATE_CON;
+ m2ua_msg_add_data(conf, MUA_TAG_IDENT_INT, 4, (uint8_t *) &interface);
+ m2ua_msg_add_data(conf, M2UA_TAG_STATE_REQ, 4, (uint8_t *) &req);
+ if (m2ua_conn_send(conn, conf, info) != 0) {
+ m2ua_msg_free(conf);
+ return -1;
+ }
+ m2ua_msg_free(conf);
+ break;
+ default:
+ LOGP(DINP, LOGL_ERROR, "Unknown STATE Request: %d\n", req);
+ break;
+ }
+
+ return 0;
+}
+
+static int m2ua_handle_est_req(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg *conf;
+
+ conf = m2ua_msg_alloc();
+ if (!conf)
+ return -1;
+
+ conf->hdr.msg_class = M2UA_CLS_MAUP;
+ conf->hdr.msg_type = M2UA_MAUP_EST_CON;
+
+ if (m2ua_conn_send(conn, conf, info) != 0) {
+ m2ua_msg_free(conf);
+ return -1;
+ }
+
+ conn->established = 1;
+ LOGP(DINP, LOGL_NOTICE, "M2UA/Link is established.\n");
+ mtp_link_up(&conn->trans->base);
+ m2ua_msg_free(conf);
+ return 0;
+}
+
+static int m2ua_handle_rel_req(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg *conf;
+
+ conf = m2ua_msg_alloc();
+ if (!conf)
+ return -1;
+
+ conf->hdr.msg_class = M2UA_CLS_MAUP;
+ conf->hdr.msg_type = M2UA_MAUP_REL_CON;
+
+ if (m2ua_conn_send(conn, conf, info) != 0) {
+ m2ua_msg_free(conf);
+ return -1;
+ }
+
+ conn->established = 0;
+ LOGP(DINP, LOGL_NOTICE, "M2UA/Link is released.\n");
+ mtp_link_down(&conn->trans->base);
+ m2ua_msg_free(conf);
+ return 0;
+}
+
+static int m2ua_handle_data(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ struct msgb *msg;
+ struct m2ua_msg_part *data;
+
+ data = m2ua_msg_find_tag(m2ua, M2UA_TAG_DATA);
+ if (!data) {
+ LOGP(DINP, LOGL_ERROR, "No DATA in DATA message.\n");
+ return -1;
+ }
+
+ if (data->len > 2048) {
+ LOGP(DINP, LOGL_ERROR, "TOO much data for us to handle.\n");
+ return -1;
+ }
+
+ msg = msgb_alloc(2048, "m2ua-data");
+ if (!msg) {
+ LOGP(DINP, LOGL_ERROR, "Failed to allocate storage.\n");
+ return -1;
+ }
+
+ msg->l2h = msgb_put(msg, data->len);
+ memcpy(msg->l2h, data->dat, data->len);
+ mtp_link_set_data(conn->trans->base.the_link, msg);
+ msgb_free(msg);
+
+ return 0;
+}
+
+static int m2ua_handle_maup(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua,
+ struct sctp_sndrcvinfo *info)
+{
+ switch (m2ua->hdr.msg_type) {
+ case M2UA_MAUP_STATE_REQ:
+ m2ua_handle_state_req(conn, m2ua, info);
+ break;
+ case M2UA_MAUP_EST_REQ:
+ m2ua_handle_est_req(conn, m2ua, info);
+ break;
+ case M2UA_MAUP_REL_REQ:
+ m2ua_handle_rel_req(conn, m2ua, info);
+ break;
+ case M2UA_MAUP_DATA:
+ m2ua_handle_data(conn, m2ua, info);
+ break;
+ default:
+ LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
+ m2ua->hdr.msg_type);
+ break;
+ }
+
+ return 0;
+}
+
+static int m2ua_handle_mgmt(struct sctp_m2ua_conn *conn,
+ struct m2ua_msg *m2ua, struct sctp_sndrcvinfo *info)
+{
+ switch (m2ua->hdr.msg_type) {
+ case M2UA_MGMT_ERROR:
+ LOGP(DINP, LOGL_ERROR, "We did something wrong. Error...\n");
+ break;
+ case M2UA_MGMT_NTFY:
+ LOGP(DINP, LOGL_NOTICE, "There was a notiy.. but we should only send it.\n");
+ break;
+ }
+
+ return 0;
+}
+
+static int m2ua_conn_handle(struct sctp_m2ua_conn *conn,
+ struct msgb *msg, struct sctp_sndrcvinfo *info)
+{
+ struct m2ua_msg *m2ua;
+ m2ua = m2ua_from_msg(msg->len, msg->data);
+ if (!m2ua) {
+ LOGP(DINP, LOGL_ERROR, "Failed to parse the message.\n");
+ return -1;
+ }
+
+ switch (m2ua->hdr.msg_class) {
+ case M2UA_CLS_MGMT:
+ m2ua_handle_mgmt(conn, m2ua, info);
+ break;
+ case M2UA_CLS_ASPSM:
+ m2ua_handle_asp(conn, m2ua, info);
+ break;
+ case M2UA_CLS_ASPTM:
+ m2ua_handle_asptm(conn, m2ua, info);
+ break;
+ case M2UA_CLS_MAUP:
+ m2ua_handle_maup(conn, m2ua, info);
+ break;
+ default:
+ LOGP(DINP, LOGL_ERROR, "Unhandled msg_class %d\n",
+ m2ua->hdr.msg_class);
+ break;
+ }
+
+ m2ua_msg_free(m2ua);
+ return 0;
+}
+
+static int m2ua_conn_read(struct bsc_fd *fd)
+{
+ struct sockaddr_in addr;
+ struct sctp_sndrcvinfo info;
+ socklen_t len = sizeof(addr);
+ struct msgb *msg;
+ int rc;
+
+ msg = msgb_alloc(2048, "m2ua buffer");
+ if (!msg) {
+ LOGP(DINP, LOGL_ERROR, "Failed to allocate buffer.\n");
+ m2ua_conn_destroy(fd->data);
+ return -1;
+ }
+
+ memset(&info, 0, sizeof(info));
+ memset(&addr, 0, sizeof(addr));
+ rc = sctp_recvmsg(fd->fd, msg->data, msg->data_len,
+ (struct sockaddr *) &addr, &len, &info, NULL);
+ if (rc < 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to read.\n");
+ m2ua_conn_destroy(fd->data);
+ return -1;
+ }
+
+ msgb_put(msg, rc);
+ LOGP(DINP, LOGL_NOTICE, "Read %d on stream: %d ssn: %d assoc: %d\n",
+ rc, info.sinfo_stream, info.sinfo_ssn, info.sinfo_assoc_id);
+ m2ua_conn_handle(fd->data, msg, &info);
+ msgb_free(msg);
+ return 0;
+}
+
+static int sctp_m2ua_write(struct mtp_link *link, struct msgb *msg)
+{
+ struct mtp_m2ua_link *trans;
+ struct sctp_m2ua_conn *conn = NULL, *tmp;
+ struct sctp_sndrcvinfo info;
+ struct m2ua_msg *m2ua;
+ uint32_t interface;
+
+ trans = (struct mtp_m2ua_link *) link;
+
+ if (llist_empty(&trans->conns))
+ return -1;
+
+ llist_for_each_entry(tmp, &trans->conns, entry)
+ if (tmp->established && tmp->asp_active && tmp->asp_up) {
+ conn = tmp;
+ break;
+ }
+
+ if (!conn) {
+ LOGP(DINP, LOGL_ERROR, "No active ASP?\n");
+ return -1;
+ }
+
+ m2ua = m2ua_msg_alloc();
+ if (!m2ua)
+ return -1;
+
+ m2ua->hdr.msg_class = M2UA_CLS_MAUP;
+ m2ua->hdr.msg_type = M2UA_MAUP_DATA;
+
+ interface = htonl(0);
+ m2ua_msg_add_data(m2ua, MUA_TAG_IDENT_INT, 4, (uint8_t *) &interface);
+ m2ua_msg_add_data(m2ua, M2UA_TAG_DATA, msg->len, msg->data);
+
+ memset(&info, 0, sizeof(info));
+ info.sinfo_stream = 1;
+ info.sinfo_assoc_id = 1;
+ info.sinfo_ppid = htonl(2);
+
+ m2ua_conn_send(conn, m2ua, &info);
+ m2ua_msg_free(m2ua);
+ return 0;
+}
+
+static int m2ua_conn_write(struct bsc_fd *fd, struct msgb *msg)
+{
+ int ret;
+ struct sctp_sndrcvinfo info;
+ memcpy(&info, msg->data, sizeof(info));
+
+ ret = sctp_send(fd->fd, msg->l2h, msgb_l2len(msg),
+ &info, 0);
+
+ if (ret != msgb_l2len(msg))
+ LOGP(DINP, LOGL_ERROR, "Failed to send %d.\n", ret);
+
+ return 0;
+}
+
+static int sctp_trans_accept(struct bsc_fd *fd, unsigned int what)
+{
+ struct sctp_event_subscribe events;
+ struct mtp_m2ua_link *trans;
+ struct sctp_m2ua_conn *conn;
+ struct sockaddr_in addr;
+ socklen_t len;
+ int s;
+
+ len = sizeof(addr);
+ s = accept(fd->fd, (struct sockaddr *) &addr, &len);
+ if (s < 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to accept.\n");
+ return -1;
+ }
+
+ trans = fd->data;
+ if (!trans->started) {
+ LOGP(DINP, LOGL_NOTICE, "The link is not started.\n");
+ close(s);
+ return -1;
+ }
+
+ LOGP(DINP, LOGL_NOTICE, "Got a new SCTP connection.\n");
+ conn = talloc_zero(fd->data, struct sctp_m2ua_conn);
+ if (!conn) {
+ LOGP(DINP, LOGL_ERROR, "Failed to create.\n");
+ close(s);
+ return -1;
+ }
+
+ conn->trans = trans;
+
+ write_queue_init(&conn->queue, 10);
+ conn->queue.bfd.fd = s;
+ conn->queue.bfd.data = conn;
+ conn->queue.bfd.when = BSC_FD_READ;
+ conn->queue.read_cb = m2ua_conn_read;
+ conn->queue.write_cb = m2ua_conn_write;
+
+ if (bsc_register_fd(&conn->queue.bfd) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to register.\n");
+ close(s);
+ talloc_free(conn);
+ return -1;
+ }
+
+ memset(&events, 0, sizeof(events));
+ events.sctp_data_io_event = 1;
+ setsockopt(s, SOL_SCTP, SCTP_EVENTS, &events, sizeof(events));
+
+ llist_add_tail(&conn->entry, &trans->conns);
+ return 0;
+}
+
+static int sctp_m2ua_dummy(struct mtp_link *link)
+{
+ return 0;
+}
+
+static int sctp_m2ua_start(struct mtp_link *link)
+{
+ struct mtp_m2ua_link *trans = (struct mtp_m2ua_link *) link;
+
+ trans->started = 1;
+ return 0;
+}
+
+static int sctp_m2ua_reset(struct mtp_link *link)
+{
+ struct sctp_m2ua_conn *conn, *tmp;
+ struct mtp_m2ua_link *transp = (struct mtp_m2ua_link *) link;
+
+ llist_for_each_entry_safe(conn, tmp, &transp->conns, entry)
+ m2ua_conn_destroy(conn);
+
+ return 0;
+}
+
+struct mtp_m2ua_link *sctp_m2ua_transp_create(const char *ip, int port)
+{
+ int sctp;
+ struct sockaddr_in addr;
+ struct mtp_m2ua_link *trans;
+
+ sctp = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP);
+ if (!sctp) {
+ LOGP(DINP, LOGL_ERROR, "Failed to create socket.\n");
+ return NULL;
+ }
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ addr.sin_addr.s_addr = inet_addr(ip);
+
+ if (bind(sctp, (struct sockaddr *) &addr, sizeof(addr)) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to bind.\n");
+ close(sctp);
+ return NULL;
+ }
+
+ if (listen(sctp, 1) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to listen.\n");
+ close(sctp);
+ return NULL;
+ }
+
+ int on = 1;
+ setsockopt(sctp, SOL_SCTP, 112, &on, sizeof(on));
+
+ trans = talloc_zero(NULL, struct mtp_m2ua_link);
+ if (!trans) {
+ LOGP(DINP, LOGL_ERROR, "Remove the talloc.\n");
+ close(sctp);
+ return NULL;
+ }
+
+ trans->base.shutdown = sctp_m2ua_dummy;
+ trans->base.clear_queue = sctp_m2ua_dummy;
+ trans->base.reset = sctp_m2ua_reset;
+ trans->base.start = sctp_m2ua_start;
+ trans->base.write = sctp_m2ua_write;
+
+ trans->bsc.fd = sctp;
+ trans->bsc.data = trans;
+ trans->bsc.cb = sctp_trans_accept;
+ trans->bsc.when = BSC_FD_READ;
+
+ if (bsc_register_fd(&trans->bsc) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to register the fd.\n");
+ talloc_free(trans);
+ close(sctp);
+ return NULL;
+ }
+
+ INIT_LLIST_HEAD(&trans->conns);
+ return trans;
+}
+