sccp: Use the external libosmo-sccp as sccp implementation

Add --enable-nat and --enable-osmo-bsc to build applications
requiring the Osmo SCCP library to be installed. We are not
using autodiscover as this is out of fashion.

6 files changed, 23 insertions, 1438 deletions

diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index af77f503c..523ff6c34 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -3,13 +3,18 @@ AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS)
 AM_LDFLAGS = $(LIBOSMOCORE_LIBS)
 
 # build current directory before building gprs
-SUBDIRS = . ipaccess gprs nat bsc
+SUBDIRS = . ipaccess gprs
 
-sbin_PROGRAMS = bsc_hack bs11_config isdnsync bsc_mgcp
-noinst_LIBRARIES = libbsc.a libmsc.a libvty.a libsccp.a libmgcp.a
+# Conditional modules
+if BUILD_NAT
+SUBDIRS += nat
+endif
+if BUILD_BSC
+SUBDIRS += bsc
+endif
 
-bscdir = $(libdir)
-bsc_LIBRARIES = libsccp.a
+sbin_PROGRAMS = bsc_hack bs11_config isdnsync bsc_mgcp
+noinst_LIBRARIES = libbsc.a libmsc.a libvty.a libmgcp.a
 
 libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
 		chan_alloc.c debug.c socket.c abis_nm_vty.c \
@@ -28,8 +33,6 @@ libmsc_a_SOURCES = gsm_subscriber.c db.c \
 
 libvty_a_SOURCES = common_vty.c
 
-libsccp_a_SOURCES = sccp/sccp.c
-
 libmgcp_a_SOURCES = mgcp/mgcp_protocol.c mgcp/mgcp_network.c mgcp/mgcp_vty.c
 
 bsc_hack_SOURCES = bsc_hack.c bsc_init.c bsc_vty.c vty_interface_layer3.c
diff --git a/openbsc/src/bsc/Makefile.am b/openbsc/src/bsc/Makefile.am
index 3a289c52d..6e179a0c1 100644
--- a/openbsc/src/bsc/Makefile.am
+++ b/openbsc/src/bsc/Makefile.am
@@ -1,5 +1,5 @@
 INCLUDES = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS)
+AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOSCCP_CFLAGS)
 AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS)
 
 bin_PROGRAMS = osmo-bsc
@@ -8,5 +8,6 @@ bin_PROGRAMS = osmo-bsc
 osmo_bsc_SOURCES = osmo_bsc_main.c osmo_bsc_rf.c osmo_bsc_vty.c osmo_bsc_api.c \
 		   $(top_srcdir)/src/debug.c $(top_srcdir)/src/bsc_msc.c \
 		   $(top_srcdir)/src/bsc_init.c
-osmo_bsc_LDADD = $(top_builddir)/src/libvty.a $(top_builddir)/src/libsccp.a \
-		 $(top_builddir)/src/libmgcp.a $(top_builddir)/src/libbsc.a
+osmo_bsc_LDADD = $(top_builddir)/src/libvty.a \
+		 $(top_builddir)/src/libmgcp.a $(top_builddir)/src/libbsc.a \
+		 $(LIBOSMOSCCP_LIBS)
diff --git a/openbsc/src/bsc/osmo_bsc_main.c b/openbsc/src/bsc/osmo_bsc_main.c
index b1c5001a9..a6782276b 100644
--- a/openbsc/src/bsc/osmo_bsc_main.c
+++ b/openbsc/src/bsc/osmo_bsc_main.c
@@ -26,6 +26,8 @@
 #include <osmocom/vty/command.h>
 #include <osmocore/talloc.h>
 
+#include <sccp/sccp.h>
+
 #define _GNU_SOURCE
 #include <getopt.h>
 
@@ -158,6 +160,9 @@ int main(int argc, char **argv)
 	/* seed the PRNG */
 	srand(time(NULL));
 
+	/* initialize SCCP */
+	sccp_set_log_area(DSCCP);
+
 
 	rc = bsc_bootstrap_network(NULL, config_file);
 	if (rc < 0) {
diff --git a/openbsc/src/nat/Makefile.am b/openbsc/src/nat/Makefile.am
index 0ca3bdfc2..2f37f5cd2 100644
--- a/openbsc/src/nat/Makefile.am
+++ b/openbsc/src/nat/Makefile.am
@@ -1,5 +1,5 @@
 INCLUDES = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS)
+AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOSCCP_CFLAGS)
 AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS)
 
 bin_PROGRAMS = bsc_nat
@@ -8,6 +8,6 @@ bin_PROGRAMS = bsc_nat
 bsc_nat_SOURCES = bsc_filter.c bsc_mgcp_utils.c bsc_nat.c bsc_nat_utils.c \
 		  bsc_nat_vty.c bsc_sccp.c \
 		$(top_srcdir)/src/debug.c $(top_srcdir)/src/bsc_msc.c
-bsc_nat_LDADD = $(top_builddir)/src/libvty.a $(top_builddir)/src/libsccp.a \
+bsc_nat_LDADD = $(top_builddir)/src/libvty.a \
 		$(top_builddir)/src/libmgcp.a $(top_builddir)/src/libbsc.a \
-		-lrt
+		-lrt $(LIBOSMOSCCP_LIBS)
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index 538472ac2..0a3719341 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -1178,6 +1178,7 @@ int main(int argc, char** argv)
 	signal(SIGPIPE, SIG_IGN);
 
 	/* recycle timer */
+	sccp_set_log_area(DSCCP);
 	sccp_close.cb = sccp_close_unconfirmed;
 	sccp_close.data = NULL;
 	bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0);
diff --git a/openbsc/src/sccp/sccp.c b/openbsc/src/sccp/sccp.c
deleted file mode 100644
index 36570808b..000000000
--- a/openbsc/src/sccp/sccp.c
+++ /dev/null
@@ -1,1425 +0,0 @@
-/*
- * SCCP management code
- *
- * (C) 2009, 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2009, 2010 by On-Waves
- *
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-
-#include <string.h>
-
-#include <osmocore/msgb.h>
-#include <openbsc/debug.h>
-#include <osmocore/talloc.h>
-
-#include <sccp/sccp.h>
-
-
-static void *tall_sccp_ctx;
-static LLIST_HEAD(sccp_connections);
-
-#define SCCP_MSG_SIZE 4096
-#define SCCP_MSG_HEADROOM 128
-
-/* global data */
-const struct sockaddr_sccp sccp_ssn_bssap = {
-	.sccp_family	= 0,
-	.sccp_ssn	= SCCP_SSN_BSSAP,
-};
-
-struct sccp_system {
-	/* layer3 -> layer2 */
-	void (*write_data)(struct msgb *data, void *context);
-	void *write_context;
-};
-
-
-static struct sccp_system sccp_system = {
-	.write_data = NULL,
-};
-
-struct sccp_data_callback {
-	/* connection based */
-	int (*accept_cb)(struct sccp_connection *, void *);
-	void *accept_context;
-
-	/* connection less */
-	int (*read_cb)(struct msgb *, unsigned int, void *);
-	void *read_context;
-
-	uint8_t ssn;
-	struct llist_head callback;
-};
-
-static LLIST_HEAD(sccp_callbacks);
-
-static struct sccp_data_callback *_find_ssn(uint8_t ssn)
-{
-	struct sccp_data_callback *cb;
-
-	llist_for_each_entry(cb, &sccp_callbacks, callback) {
-		if (cb->ssn == ssn)
-			return cb;
-	}
-
-	/* need to add one */
-	cb = talloc_zero(tall_sccp_ctx, struct sccp_data_callback);
-	if (!cb) {
-		LOGP(DSCCP, LOGL_ERROR, "Failed to allocate sccp callback.\n");
-		return NULL;
-	}
-
-	cb->ssn = ssn;
-	llist_add_tail(&cb->callback, &sccp_callbacks);
-	return cb;
-}
-
-
-static void _send_msg(struct msgb *msg)
-{
-	sccp_system.write_data(msg, sccp_system.write_context);
-}
-
-/*
- * parsing routines
- */
-static int copy_address(struct sccp_address *addr, uint8_t offset, struct msgb *msgb)
-{
-	struct sccp_called_party_address *party;
-
-	int room = msgb_l2len(msgb) - offset;
-	uint8_t read = 0;
-	uint8_t length;
-
-	if (room <= 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Not enough room for an address: %u\n", room);
-		return -1;
-	}
-
-	length = msgb->l2h[offset];
-	if (room <= length) {
-		LOGP(DSCCP, LOGL_ERROR, "Not enough room for optional data %u %u\n", room, length);
-		return -1;
-	}
-
-
-	party = (struct sccp_called_party_address *)(msgb->l2h + offset + 1);
-	if (party->point_code_indicator) {
-		if (length <= read + 2) {
-		    LOGP(DSCCP, LOGL_ERROR, "POI does not fit %u\n", length);
-		    return -1;
-		}
-
-
-		memcpy(&addr->poi, &party->data[read], 2);
-		read += 2;
-	}
-
-	if (party->ssn_indicator) {
-		if (length <= read + 1) {
-		    LOGP(DSCCP, LOGL_ERROR, "SSN does not fit %u\n", length);
-		    return -1;
-		}
-
-		addr->ssn = party->data[read];
-		read += 1;
-	}
-
-	if (party->global_title_indicator) {
-		LOGP(DSCCP, LOGL_ERROR, "GTI not supported %u\n", *(uint8_t *)party);
-		return -1;
-	}
-
-	addr->address = *party;
-	return 0;
-}
-
-static int check_address(struct sccp_address *addr)
-{
-	/* ignore point_code_indicator... it should be zero... but */
-	if (addr->address.ssn_indicator != 1
-	    || addr->address.global_title_indicator == 1
-	    || addr->address.routing_indicator != 1) {
-		LOGP(DSCCP, LOGL_ERROR,
-			"Invalid called address according to 08.06: 0x%x 0x%x\n",
-			*(uint8_t *)&addr->address, addr->ssn);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int _sccp_parse_optional_data(const int offset,
-				     struct msgb *msgb, struct sccp_optional_data *data)
-{
-	uint16_t room = msgb_l2len(msgb) - offset;
-	uint16_t read = 0;
-
-	while (room > read) {
-		uint8_t type = msgb->l2h[offset + read];
-		if (type == SCCP_PNC_END_OF_OPTIONAL)
-			return 0;
-
-		if (read + 1 >= room) {
-			LOGP(DSCCP, LOGL_ERROR, "no place for length\n");
-			return 0;
-		}
-
-		uint8_t length = msgb->l2h[offset + read + 1];
-		read += 2 + length;
-
-
-		if (room <= read) {
-			LOGP(DSCCP, LOGL_ERROR,
-			       "no space for the data: type: %d read: %d room: %d l2: %d\n",
-			       type, read, room, msgb_l2len(msgb));
-			return 0;
-		}
-
-		if (type == SCCP_PNC_DATA) {
-			data->data_len = length;
-			data->data_start = offset + read - length;
-		}
-
-	}
-
-	return -1;
-}
-
-int _sccp_parse_connection_request(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static const uint32_t header_size =
-			sizeof(struct sccp_connection_request);
-	static const uint32_t optional_offset =
-			offsetof(struct sccp_connection_request, optional_start);
-	static const uint32_t called_offset =
-			offsetof(struct sccp_connection_request, variable_called);
-
-	struct sccp_connection_request *req = (struct sccp_connection_request *)msgb->l2h;
-	struct sccp_optional_data optional_data;
-
-	/* header check */
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	/* copy out the calling and called address. Add the offset */
-	if (copy_address(&result->called, called_offset + req->variable_called, msgb) != 0)
-		return -1;
-
-	if (check_address(&result->called) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Invalid called address according to 08.06: 0x%x 0x%x\n",
-			*(uint8_t *)&result->called.address, result->called.ssn);
-		return -1;
-	}
-
-	result->source_local_reference = &req->source_local_reference;
-
-	/*
-	 * parse optional data.
-	 */
-	memset(&optional_data, 0, sizeof(optional_data));
-	if (_sccp_parse_optional_data(optional_offset + req->optional_start, msgb, &optional_data) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "parsing of optional data failed.\n");
-		return -1;
-	}
-
-	if (optional_data.data_len != 0) {
-		msgb->l3h = &msgb->l2h[optional_data.data_start];
-		result->data_len = optional_data.data_len;
-	} else {
-		result->data_len = 0;
-	}
-
-	return 0;
-}
-
-int _sccp_parse_connection_released(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static int header_size = sizeof(struct sccp_connection_released);
-	static int optional_offset = offsetof(struct sccp_connection_released, optional_start);
-
-	struct sccp_optional_data optional_data;
-	struct sccp_connection_released *rls = (struct sccp_connection_released *) msgb->l2h;
-
-	/* we don't have enough size for the struct */
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb > header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	memset(&optional_data, 0, sizeof(optional_data));
-	if (_sccp_parse_optional_data(optional_offset + rls->optional_start, msgb, &optional_data) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "parsing of optional data failed.\n");
-		return -1;
-	}
-
-	result->source_local_reference = &rls->source_local_reference;
-	result->destination_local_reference = &rls->destination_local_reference;
-
-	if (optional_data.data_len != 0) {
-		msgb->l3h = &msgb->l2h[optional_data.data_start];
-		result->data_len = optional_data.data_len;
-	} else {
-		result->data_len = 0;
-	}
-
-	return 0;
-}
-
-int _sccp_parse_connection_refused(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static const uint32_t header_size =
-			sizeof(struct sccp_connection_refused);
-	static int optional_offset = offsetof(struct sccp_connection_refused, optional_start);
-
-	struct sccp_optional_data optional_data;
-	struct sccp_connection_refused *ref;
-
-	/* header check */
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	ref = (struct sccp_connection_refused *) msgb->l2h;
-
-	result->destination_local_reference = &ref->destination_local_reference;
-
-	memset(&optional_data, 0, sizeof(optional_data));
-	if (_sccp_parse_optional_data(optional_offset + ref->optional_start, msgb, &optional_data) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "parsing of optional data failed.\n");
-		return -1;
-	}
-
-	/* optional data */
-	if (optional_data.data_len != 0) {
-		msgb->l3h = &msgb->l2h[optional_data.data_start];
-		result->data_len = optional_data.data_len;
-	} else {
-		result->data_len = 0;
-	}
-
-	return 0;
-}
-
-int _sccp_parse_connection_confirm(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static uint32_t header_size =
-		    sizeof(struct sccp_connection_confirm);
-	static const uint32_t optional_offset =
-			offsetof(struct sccp_connection_confirm, optional_start);
-
-	struct sccp_optional_data optional_data;
-	struct sccp_connection_confirm *con;
-
-	/* header check */
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	con = (struct sccp_connection_confirm *) msgb->l2h;
-	result->destination_local_reference = &con->destination_local_reference;
-	result->source_local_reference = &con->source_local_reference;
-
-	memset(&optional_data, 0, sizeof(optional_data));
-	if (_sccp_parse_optional_data(optional_offset + con->optional_start, msgb, &optional_data) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "parsing of optional data failed.\n");
-		return -1;
-	}
-
-	if (optional_data.data_len != 0) {
-		msgb->l3h = &msgb->l2h[optional_data.data_start];
-		result->data_len = optional_data.data_len;
-	} else {
-		result->data_len = 0;
-	}
-
-	return 0;
-}
-
-int _sccp_parse_connection_release_complete(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static int header_size = sizeof(struct sccp_connection_release_complete);
-
-	struct sccp_connection_release_complete *cmpl;
-
-	/* header check */
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	cmpl = (struct sccp_connection_release_complete *) msgb->l2h;
-	result->source_local_reference = &cmpl->source_local_reference;
-	result->destination_local_reference = &cmpl->destination_local_reference;
-
-	return 0;
-}
-
-int _sccp_parse_connection_dt1(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static int header_size = sizeof(struct sccp_data_form1);
-	static int variable_offset = offsetof(struct sccp_data_form1, variable_start);
-
-	struct sccp_data_form1 *dt1 = (struct sccp_data_form1 *)msgb->l2h;
-
-	/* we don't have enough size for the struct */
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb > header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	if (dt1->segmenting != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "This packet has segmenting, not supported: %d\n", dt1->segmenting);
-		return -1;
-	}
-
-	result->destination_local_reference = &dt1->destination_local_reference;
-
-	/* some more  size checks in here */
-	if (msgb_l2len(msgb) < variable_offset + dt1->variable_start + 1) {
-		LOGP(DSCCP, LOGL_ERROR, "Not enough space for variable start: %u %u\n",
-			msgb_l2len(msgb), dt1->variable_start);
-		return -1;
-	}
-
-	result->data_len = msgb->l2h[variable_offset + dt1->variable_start];
-	msgb->l3h = &msgb->l2h[dt1->variable_start + variable_offset + 1];
-
-	if (msgb_l3len(msgb) < result->data_len) {
-		LOGP(DSCCP, LOGL_ERROR, "Not enough room for the payload: %u %u\n",
-			msgb_l3len(msgb), result->data_len);
-		return -1;
-	}
-
-	return 0;
-}
-
-int _sccp_parse_udt(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static const uint32_t header_size = sizeof(struct sccp_data_unitdata);
-	static const uint32_t called_offset = offsetof(struct sccp_data_unitdata, variable_called);
-	static const uint32_t calling_offset = offsetof(struct sccp_data_unitdata, variable_calling);
-	static const uint32_t data_offset = offsetof(struct sccp_data_unitdata, variable_data);
-
-	struct sccp_data_unitdata *udt = (struct sccp_data_unitdata *)msgb->l2h;
-
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	/* copy out the calling and called address. Add the off */
-	if (copy_address(&result->called, called_offset + udt->variable_called, msgb) != 0)
-		return -1;
-
-	if (check_address(&result->called) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Invalid called address according to 08.06: 0x%x 0x%x\n",
-			*(uint8_t *)&result->called.address, result->called.ssn);
-		return -1;
-	}
-
-	if (copy_address(&result->calling, calling_offset + udt->variable_calling, msgb) != 0)
-		return -1;
-
-	if (check_address(&result->calling) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Invalid called address according to 08.06: 0x%x 0x%x\n",
-			*(uint8_t *)&result->called.address, result->called.ssn);
-	}
-
-	/* we don't have enough size for the data */
-	if (msgb_l2len(msgb) < data_offset + udt->variable_data + 1) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header + offset %u %u %u\n",
-			msgb_l2len(msgb), header_size, udt->variable_data);
-		return -1;
-	}
-
-
-	msgb->l3h = &udt->data[udt->variable_data];
-	result->data_len = msgb_l3len(msgb);
-
-	if (msgb_l3len(msgb) !=  msgb->l3h[-1]) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb is truncated is: %u should: %u\n",
-			msgb_l3len(msgb), msgb->l3h[-1]);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int _sccp_parse_it(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static const uint32_t header_size = sizeof(struct sccp_data_it);
-
-	struct sccp_data_it *it;
-
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		        msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	it = (struct sccp_data_it *) msgb->l2h;
-	result->data_len = 0;
-	result->source_local_reference = &it->source_local_reference;
-	result->destination_local_reference = &it->destination_local_reference;
-	return 0;
-}
-
-static int _sccp_parse_err(struct msgb *msgb, struct sccp_parse_result *result)
-{
-	static const uint32_t header_size = sizeof(struct sccp_proto_err);
-
-	struct sccp_proto_err *err;
-
-	if (msgb_l2len(msgb) < header_size) {
-		LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
-		     msgb_l2len(msgb), header_size);
-		return -1;
-	}
-
-	err = (struct sccp_proto_err *) msgb->l2h;
-	result->data_len = 0;
-	result->destination_local_reference = &err->destination_local_reference;
-	return 0;
-}
-
-/*
- * Send UDT. Currently we have a fixed address...
- */
-static int _sccp_send_data(int class, const struct sockaddr_sccp *in,
-			   const struct sockaddr_sccp *out, struct msgb *payload)
-{
-	struct sccp_data_unitdata *udt;
-	uint8_t *data;
-
-	if (msgb_l3len(payload) > 256) {
-		LOGP(DSCCP, LOGL_ERROR, "The payload is too big for one udt\n");
-		return -1;
-	}
-
-	struct msgb *msg = msgb_alloc_headroom(SCCP_MSG_SIZE,
-					       SCCP_MSG_HEADROOM, "sccp: udt");
-	msg->l2h = &msg->data[0];
-	udt = (struct sccp_data_unitdata *)msgb_put(msg, sizeof(*udt));
-
-	udt->type = SCCP_MSG_TYPE_UDT;
-	udt->proto_class = class;
-	udt->variable_called = 3;
-	udt->variable_calling = 5;
-	udt->variable_data = 7;
-
-	/* for variable data we start with a size and the data */
-	data = msgb_put(msg, 1 + 2);
-	data[0] = 2;
-	data[1] = 0x42;
-	data[2] = out->sccp_ssn;
-
-	data = msgb_put(msg, 1 + 2);
-	data[0] = 2;
-	data[1] = 0x42;
-	data[2] = in->sccp_ssn;
-
-	/* copy the payload */
-	data = msgb_put(msg, 1 + msgb_l3len(payload));
-	data[0] = msgb_l3len(payload);
-	memcpy(&data[1], payload->l3h, msgb_l3len(payload));
-
-	_send_msg(msg);
-	return 0;
-}
-
-static int _sccp_handle_read(struct msgb *msgb)
-{
-	struct sccp_data_callback *cb;
-	struct sccp_parse_result result;
-
-	if (_sccp_parse_udt(msgb, &result) != 0)
-		return -1;
-
-	cb = _find_ssn(result.called.ssn);
-	if (!cb || !cb->read_cb) {
-		LOGP(DSCCP, LOGL_ERROR, "No routing for UDT for called SSN: %u\n", result.called.ssn);
-		return -1;
-	}
-
-	/* sanity check */
-	return cb->read_cb(msgb, msgb_l3len(msgb), cb->read_context);
-}
-
-/*
- * handle connection orientated methods
- */
-static int source_local_reference_is_free(struct sccp_source_reference *reference)
-{
-	struct sccp_connection *connection;
-
-	llist_for_each_entry(connection, &sccp_connections, list) {
-		if (memcmp(reference, &connection->source_local_reference, sizeof(*reference)) == 0)
-			return -1;
-	}
-
-	return 0;
-}
-
-static int destination_local_reference_is_free(struct sccp_source_reference *reference)
-{
-	struct sccp_connection *connection;
-
-	llist_for_each_entry(connection, &sccp_connections, list) {
-		if (memcmp(reference, &connection->destination_local_reference, sizeof(*reference)) == 0)
-			return -1;
-	}
-
-	return 0;
-}
-
-static int assign_source_local_reference(struct sccp_connection *connection)
-{
-	static uint32_t last_ref = 0x30000;
-	int wrapped = 0;
-
-	do {
-		struct sccp_source_reference reference;
-		reference.octet1 = (last_ref >>  0) & 0xff;
-		reference.octet2 = (last_ref >>  8) & 0xff;
-		reference.octet3 = (last_ref >> 16) & 0xff;
-
-		++last_ref;
-		/* do not use the reversed word and wrap around */
-		if ((last_ref & 0x00FFFFFF) == 0x00FFFFFF) {
-			LOGP(DSCCP, LOGL_DEBUG, "Wrapped searching for a free code\n");
-			last_ref = 0;
-			++wrapped;
-		}
-
-		if (source_local_reference_is_free(&reference) == 0) {
-			connection->source_local_reference = reference;
-			return 0;
-		}
-	} while (wrapped != 2);
-
-	LOGP(DSCCP, LOGL_ERROR, "Finding a free reference failed\n");
-	return -1;
-}
-
-static void _sccp_set_connection_state(struct sccp_connection *connection, int new_state)
-{
-	int old_state = connection->connection_state;
-
-	connection->connection_state = new_state;
-	if (connection->state_cb)
-		connection->state_cb(connection, old_state);
-}
-
-struct msgb *sccp_create_refuse(struct sccp_source_reference *src_ref, int cause, uint8_t *inp, int length)
-{
-	struct msgb *msgb;
-	struct sccp_connection_refused *ref;
-	uint8_t *data;
-
-	msgb = msgb_alloc_headroom(SCCP_MSG_SIZE,
-				   SCCP_MSG_HEADROOM, "sccp ref");
-	if (!msgb) {
-		LOGP(DSCCP, LOGL_ERROR, "Failed to allocate refusal msg.\n");
-		return NULL;
-	}
-
-	msgb->l2h = &msgb->data[0];
-
-	ref = (struct sccp_connection_refused *) msgb_put(msgb, sizeof(*ref));
-	ref->type = SCCP_MSG_TYPE_CREF;
-	memcpy(&ref->destination_local_reference, src_ref,
-	       sizeof(struct sccp_source_reference));
-	ref->cause = cause;
-	ref->optional_start = 1;
-
-	if (inp) {
-		data = msgb_put(msgb, 1 + 1 + length);
-		data[0] = SCCP_PNC_DATA;
-		data[1] = length;
-		memcpy(&data[2], inp, length);
-	}
-
-	data = msgb_put(msgb, 1);
-	data[0] = SCCP_PNC_END_OF_OPTIONAL;
-	return msgb;
-}
-
-static int _sccp_send_refuse(struct sccp_source_reference *src_ref, int cause)
-{
-	struct msgb *msgb = sccp_create_refuse(src_ref, cause, NULL, 0);
-	if (!msgb)
-		return -1;
-
-	_send_msg(msgb);
-	return 0;
-}
-
-struct msgb *sccp_create_cc(struct sccp_source_reference *src_ref,
-			    struct sccp_source_reference *dst_ref)
-{
-	struct msgb *response;
-	struct sccp_connection_confirm *confirm;
-	uint8_t *optional_data;
-
-	response = msgb_alloc_headroom(SCCP_MSG_SIZE,
-				       SCCP_MSG_HEADROOM, "sccp confirm");
-	if (!response) {
-		LOGP(DSCCP, LOGL_ERROR, "Failed to create SCCP Confirm.\n");
-		return NULL;
-	}
-
-	response->l2h = &response->data[0];
-
-	confirm = (struct sccp_connection_confirm *) msgb_put(response, sizeof(*confirm));
-
-	confirm->type = SCCP_MSG_TYPE_CC;
-	memcpy(&confirm->destination_local_reference,
-	       dst_ref, sizeof(*dst_ref));
-	memcpy(&confirm->source_local_reference,
-	       src_ref, sizeof(*src_ref));
-	confirm->proto_class = 2;
-	confirm->optional_start = 1;
-
-	optional_data = (uint8_t *) msgb_put(response, 1);
-	optional_data[0] = SCCP_PNC_END_OF_OPTIONAL;
-	return response;
-}
-
-static int _sccp_send_connection_confirm(struct sccp_connection *connection)
-{
-	struct msgb *response;
-
-	if (assign_source_local_reference(connection) != 0)
-		return -1;
-
-	response = sccp_create_cc(&connection->source_local_reference,
-				  &connection->destination_local_reference);
-	if (!response)
-		return -1;
-
-	_send_msg(response);
-	_sccp_set_connection_state(connection, SCCP_CONNECTION_STATE_ESTABLISHED);
-	return 0;
-}
-
-static int _sccp_send_connection_request(struct sccp_connection *connection,
-					 const struct sockaddr_sccp *called, struct msgb *msg)
-{
-	struct msgb *request;
-	struct sccp_connection_request *req;
-	uint8_t *data;
-	uint8_t extra_size = 3 + 1;
-
-
-	if (msg && (msgb_l3len(msg) < 3 || msgb_l3len(msg) > 130)) {
-		LOGP(DSCCP, LOGL_ERROR, "Invalid amount of data... %d\n", msgb_l3len(msg));
-		return -1;
-	}
-
-	/* try to find a id */
-	if (assign_source_local_reference(connection) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Assigning a local reference failed.\n");
-		_sccp_set_connection_state(connection, SCCP_CONNECTION_STATE_SETUP_ERROR);
-		return -1;
-	}
-
-
-	if (msg)
-		extra_size += 2 + msgb_l3len(msg);
-	request = msgb_alloc_headroom(SCCP_MSG_SIZE,
-				      SCCP_MSG_HEADROOM, "sccp connection request");
-	request->l2h = &request->data[0];
-	req = (struct sccp_connection_request *) msgb_put(request, sizeof(*req));
-
-	req->type = SCCP_MSG_TYPE_CR;
-	memcpy(&req->source_local_reference, &connection->source_local_reference,
-	       sizeof(connection->source_local_reference));
-	req->proto_class = 2;
-	req->variable_called = 2;
-	req->optional_start = 4;
-
-	/* write the called party address */
-	data = msgb_put(request, 1 + 2);
-	data[0] = 2;
-	data[1] = 0x42;
-	data[2] = called->sccp_ssn;
-
-	/* write the payload */
-	if (msg) {
-	    data = msgb_put(request, 2 + msgb_l3len(msg));
-	    data[0] = SCCP_PNC_DATA;
-	    data[1] = msgb_l3len(msg);
-	    memcpy(&data[2], msg->l3h, msgb_l3len(msg));
-	}
-
-	data = msgb_put(request, 1);
-	data[0] = SCCP_PNC_END_OF_OPTIONAL;
-
-	llist_add_tail(&connection->list, &sccp_connections);
-	_sccp_set_connection_state(connection, SCCP_CONNECTION_STATE_REQUEST);
-
-	_send_msg(request);
-	return 0;
-}
-
-struct msgb *sccp_create_dt1(struct sccp_source_reference *dst_ref, uint8_t *inp_data, uint8_t len)
-{
-	struct msgb *msgb;
-	struct sccp_data_form1 *dt1;
-	uint8_t *data;
-
-	msgb = msgb_alloc_headroom(SCCP_MSG_SIZE,
-				   SCCP_MSG_HEADROOM, "sccp dt1");
-	if (!msgb) {
-		LOGP(DSCCP, LOGL_ERROR, "Failed to create DT1 msg.\n");
-		return NULL;
-	}
-
-	msgb->l2h = &msgb->data[0];
-
-	dt1 = (struct sccp_data_form1 *) msgb_put(msgb, sizeof(*dt1));
-	dt1->type = SCCP_MSG_TYPE_DT1;
-	memcpy(&dt1->destination_local_reference, dst_ref,
-	       sizeof(struct sccp_source_reference));
-	dt1->segmenting = 0;
-
-	/* copy the data */
-	dt1->variable_start = 1;
-	data = msgb_put(msgb, 1 + len);
-	data[0] = len;
-	memcpy(&data[1], inp_data, len);
-
-	return msgb;
-}
-
-static int _sccp_send_connection_data(struct sccp_connection *conn, struct msgb *_data)
-{
-	struct msgb *msgb;
-
-	if (msgb_l3len(_data) < 2 || msgb_l3len(_data) > 256) {
-		LOGP(DSCCP, LOGL_ERROR, "data size too big, segmenting unimplemented.\n");
-		return -1;
-	}
-
-	msgb = sccp_create_dt1(&conn->destination_local_reference,
-			       _data->l3h, msgb_l3len(_data));
-	if (!msgb)
-		return -1;
-
-	_send_msg(msgb);
-	return 0;
-}
-
-static int _sccp_send_connection_it(struct sccp_connection *conn)
-{
-	struct msgb *msgb;
-	struct sccp_data_it *it;
-
-	msgb = msgb_alloc_headroom(SCCP_MSG_SIZE,
-				   SCCP_MSG_HEADROOM, "sccp it");
-	msgb->l2h = &msgb->data[0];
-	it = (struct sccp_data_it *) msgb_put(msgb, sizeof(*it));
-	it->type = SCCP_MSG_TYPE_IT;
-	memcpy(&it->destination_local_reference, &conn->destination_local_reference,
-		sizeof(struct sccp_source_reference));
-	memcpy(&it->source_local_reference, &conn->source_local_reference,
-		sizeof(struct sccp_source_reference));
-
-	it->proto_class = 0x2;
-	it->sequencing[0] = it->sequencing[1] = 0;
-	it->credit = 0;
-
-	_send_msg(msgb);
-	return 0;
-}
-
-struct msgb *sccp_create_rlsd(struct sccp_source_reference *src_ref,
-			      struct sccp_source_reference *dst_ref, int cause)
-{
-	struct msgb *msg;
-	struct sccp_connection_released *rel;
-	uint8_t *data;
-
-	msg = msgb_alloc_headroom(SCCP_MSG_SIZE, SCCP_MSG_HEADROOM,
-				  "sccp: connection released");
-	if (!msg) {
-		LOGP(DSCCP, LOGL_ERROR, "Failed to allocate RLSD.\n");
-		return NULL;
-	}
-
-	msg->l2h = &msg->data[0];
-	rel = (struct sccp_connection_released *) msgb_put(msg, sizeof(*rel));
-	rel->type = SCCP_MSG_TYPE_RLSD;
-	rel->release_cause = cause;
-
-	/* copy the source references */
-	memcpy(&rel->destination_local_reference, dst_ref,
-	       sizeof(struct sccp_source_reference));
-	memcpy(&rel->source_local_reference, src_ref,
-	       sizeof(struct sccp_source_reference));
-
-	data = msgb_put(msg, 1);
-	data[0] = SCCP_PNC_END_OF_OPTIONAL;
-	return msg;
-}
-
-static int _sccp_send_connection_released(struct sccp_connection *conn, int cause)
-{
-	struct msgb *msg;
-
-	msg = sccp_create_rlsd(&conn->source_local_reference,
-			       &conn->destination_local_reference,
-			       cause);
-	if (!msg)
-		return -1;
-
-	_sccp_set_connection_state(conn, SCCP_CONNECTION_STATE_RELEASE);
-	_send_msg(msg);
-	return 0;
-}
-
-/*
- * Open a connection. The following is going to happen:
- *
- *	- Verify the packet, e.g. that we have no other connection
- *	  that id.
- *      - Ask the user if he wants to accept the connection
- *      - Try to open the connection by assigning a source local reference
- *        and sending the packet
- */
-static int _sccp_handle_connection_request(struct msgb *msgb)
-{
-	struct sccp_parse_result result;
-
-	struct sccp_data_callback *cb;
-	struct sccp_connection *connection;
-
-	if (_sccp_parse_connection_request(msgb, &result) != 0)
-		return -1;
-
-	cb = _find_ssn(result.called.ssn);
-	if (!cb || !cb->accept_cb) {
-		LOGP(DSCCP, LOGL_ERROR, "No routing for CR for called SSN: %u\n", result.called.ssn);
-		return -1;
-	}
-
-	/* check if the system wants this connection */
-	connection = talloc_zero(tall_sccp_ctx, struct sccp_connection);
-	if (!connection) {
-		LOGP(DSCCP, LOGL_ERROR, "Allocation failed\n");
-		return -1;
-	}
-
-	/*
-	 * sanity checks:
-	 *	- Is the source_local_reference in any other connection?
-	 * then will call accept, assign a "destination" local reference
-	 * and send a connection confirm, otherwise we will send a refuseed
-	 * one....
-	 */
-	if (destination_local_reference_is_free(result.source_local_reference) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Need to reject connection with existing reference\n");
-		_sccp_send_refuse(result.source_local_reference, SCCP_REFUSAL_SCCP_FAILURE);
-		talloc_free(connection);
-		return -1;
-	}
-
-	connection->incoming = 1;
-	connection->destination_local_reference = *result.source_local_reference;
-
-	if (cb->accept_cb(connection, cb->accept_context) != 0) {
-		_sccp_send_refuse(result.source_local_reference, SCCP_REFUSAL_END_USER_ORIGINATED);
-		_sccp_set_connection_state(connection, SCCP_CONNECTION_STATE_REFUSED);
-		talloc_free(connection);
-		return 0;
-	}
-
-
-	llist_add_tail(&connection->list, &sccp_connections);
-
-	if (_sccp_send_connection_confirm(connection) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Sending confirm failed... no available source reference?\n");
-
-		_sccp_send_refuse(result.source_local_reference, SCCP_REFUSAL_SCCP_FAILURE);
-		_sccp_set_connection_state(connection, SCCP_CONNECTION_STATE_REFUSED);
-		llist_del(&connection->list);
-		talloc_free(connection);
-
-		return -1;
-	}
-
-	/*
-	 * If we have data let us forward things.
-	 */
-	if (result.data_len != 0 && connection->data_cb) {
-		connection->data_cb(connection, msgb, result.data_len);
-	}
-
-	return 0;
-}
-
-/* Handle the release confirmed */
-static int _sccp_handle_connection_release_complete(struct msgb *msgb)
-{
-	struct sccp_parse_result result;
-	struct sccp_connection *conn;
-
-	if (_sccp_parse_connection_release_complete(msgb, &result) != 0)
-		return -1;
-
-	/* find the connection */
-	llist_for_each_entry(conn, &sccp_connections, list) {
-		if (conn->data_cb
-		    && memcmp(&conn->source_local_reference,
-			      result.destination_local_reference,
-			      sizeof(conn->source_local_reference)) == 0
-		    && memcmp(&conn->destination_local_reference,
-			      result.source_local_reference,
-			      sizeof(conn->destination_local_reference)) == 0) {
-		    goto found;
-		}
-	}
-
-
-	LOGP(DSCCP, LOGL_ERROR, "Release complete of unknown connection\n");
-	return -1;
-
-found:
-	llist_del(&conn->list);
-	_sccp_set_connection_state(conn, SCCP_CONNECTION_STATE_RELEASE_COMPLETE);
-	return 0;
-}
-
-/* Handle the Data Form 1 message */
-static int _sccp_handle_connection_dt1(struct msgb *msgb)
-{
-	struct sccp_parse_result result;
-	struct sccp_connection *conn;
-
-	if (_sccp_parse_connection_dt1(msgb, &result) != 0)
-		return -1;
-
-	/* lookup if we have a connection with the given reference */
-	llist_for_each_entry(conn, &sccp_connections, list) {
-		if (conn->data_cb
-		    && memcmp(&conn->source_local_reference,
-			      result.destination_local_reference,
-			      sizeof(conn->source_local_reference)) == 0) {
-			goto found;
-		}
-	}
-
-	LOGP(DSCCP, LOGL_ERROR, "No connection found for dt1 data\n");
-	return -1;
-
-found:
-	conn->data_cb(conn, msgb, result.data_len);
-	return 0;
-}
-
-/* confirm a connection release */
-static int _sccp_send_connection_release_complete(struct sccp_connection *connection)
-{
-	struct msgb *msgb;
-	struct sccp_connection_release_complete *rlc;
-
-	msgb = msgb_alloc_headroom(SCCP_MSG_SIZE,
-				   SCCP_MSG_HEADROOM, "sccp rlc");
-	msgb->l2h = &msgb->data[0];
-
-	rlc = (struct sccp_connection_release_complete *) msgb_put(msgb, sizeof(*rlc));
-	rlc->type = SCCP_MSG_TYPE_RLC;
-	memcpy(&rlc->destination_local_reference,
-	       &connection->destination_local_reference, sizeof(struct sccp_source_reference));
-	memcpy(&rlc->source_local_reference,
-	       &connection->source_local_reference, sizeof(struct sccp_source_reference));
-
-	_send_msg(msgb);
-
-	/*
-	 * Remove from the list of active connections and set the state. User code
-	 * should now free the entry.
-	 */
-	llist_del(&connection->list);
-	_sccp_set_connection_state(connection, SCCP_CONNECTION_STATE_RELEASE_COMPLETE);
-	return 0;
-}
-
-/* connection released, send a released confirm */
-static int _sccp_handle_connection_released(struct msgb *msgb)
-{
-	struct sccp_parse_result result;
-	struct sccp_connection *conn;
-
-	if (_sccp_parse_connection_released(msgb, &result) == -1)
-		return -1;
-
-	/* lookup if we have a connection with the given reference */
-	llist_for_each_entry(conn, &sccp_connections, list) {
-		if (conn->data_cb
-		    && memcmp(&conn->source_local_reference,
-			      result.destination_local_reference,
-			      sizeof(conn->source_local_reference)) == 0
-		    && memcmp(&conn->destination_local_reference,
-			      result.source_local_reference,
-			      sizeof(conn->destination_local_reference)) == 0) {
-		    goto found;
-		}
-	}
-
-
-	LOGP(DSCCP, LOGL_ERROR, "Unknown connection was released.\n");
-	return -1;
-
-	/* we have found a connection */
-found:
-	/* optional data */
-	if (result.data_len != 0 && conn->data_cb) {
-		conn->data_cb(conn, msgb, result.data_len);
-	}
-
-	/* generate a response */
-	if (_sccp_send_connection_release_complete(conn) != 0) {
-		LOGP(DSCCP, LOGL_ERROR, "Sending release confirmed failed\n");
-		return -1;
-	}
-
-	return 0;
-}
-
-static int _sccp_handle_connection_refused(struct msgb *msgb)
-{
-	struct sccp_parse_result result;
-	struct sccp_connection *conn;
-
-	if (_sccp_parse_connection_refused(msgb, &result) != 0)
-		return -1;
-
-	/* lookup if we have a connection with the given reference */
-	llist_for_each_entry(conn, &sccp_connections, list) {
-		if (conn->incoming == 0 && conn->data_cb
-		    && memcmp(&conn->source_local_reference,
-			      result.destination_local_reference,
-			      sizeof(conn->source_local_reference)) == 0) {
-		    goto found;
-		}
-	}
-
-	LOGP(DSCCP, LOGL_ERROR, "Refused but no connection found\n");
-	return -1;
-
-found:
-	/* optional data */
-	if (result.data_len != 0 && conn->data_cb) {
-		conn->data_cb(conn, msgb, result.data_len);
-	}
-
-
-	llist_del(&conn->list);
-	_sccp_set_connection_state(conn, SCCP_CONNECTION_STATE_REFUSED);
-	return 0;
-}
-
-static int _sccp_handle_connection_confirm(struct msgb *msgb)
-{
-	struct sccp_parse_result result;
-	struct sccp_connection *conn;
-
-	if (_sccp_parse_connection_confirm(msgb, &result) != 0)
-		return -1;
-
-	/* lookup if we have a connection with the given reference */
-	llist_for_each_entry(conn, &sccp_connections, list) {
-		if (conn->incoming == 0 && conn->data_cb
-		    && memcmp(&conn->source_local_reference,
-			      result.destination_local_reference,
-			      sizeof(conn->source_local_reference)) == 0) {
-		    goto found;
-		}
-	}
-
-	LOGP(DSCCP, LOGL_ERROR, "Confirmed but no connection found\n");
-	return -1;
-
-found:
-	/* copy the addresses of the connection */
-	conn->destination_local_reference = *result.source_local_reference;
-	_sccp_set_connection_state(conn, SCCP_CONNECTION_STATE_ESTABLISHED);
-
-	/* optional data */
-	if (result.data_len != 0 && conn->data_cb) {
-		conn->data_cb(conn, msgb, result.data_len);
-	}
-
-	return 0;
-}
-
-
-int sccp_system_init(void (*outgoing)(struct msgb *data, void *ctx), void *ctx)
-{
-	sccp_system.write_data = outgoing;
-	sccp_system.write_context = ctx;
-
-	return 0;
-}
-
-/* oh my god a real SCCP packet. need to dispatch it now */
-int sccp_system_incoming(struct msgb *msgb)
-{
-	if (msgb_l2len(msgb) < 1 ) {
-		LOGP(DSCCP, LOGL_ERROR, "Too short packet\n");
-		return -1;
-	}
-
-	int type = msgb->l2h[0];
-
-	switch(type) {
-	case SCCP_MSG_TYPE_CR:
-		return _sccp_handle_connection_request(msgb);
-		break;
-	case SCCP_MSG_TYPE_RLSD:
-		return _sccp_handle_connection_released(msgb);
-		break;
-	case SCCP_MSG_TYPE_CREF:
-		return _sccp_handle_connection_refused(msgb);
-		break;
-	case SCCP_MSG_TYPE_CC:
-		return _sccp_handle_connection_confirm(msgb);
-		break;
-	case SCCP_MSG_TYPE_RLC:
-		return _sccp_handle_connection_release_complete(msgb);
-		break;
-	case SCCP_MSG_TYPE_DT1:
-		return _sccp_handle_connection_dt1(msgb);
-		break;
-	case SCCP_MSG_TYPE_UDT:
-		return _sccp_handle_read(msgb);
-		break;
-	default:
-		LOGP(DSCCP, LOGL_ERROR, "unimplemented msg type: %d\n", type);
-	};
-
-	return -1;
-}
-
-/* create a packet from the data */
-int sccp_connection_write(struct sccp_connection *connection, struct msgb *data)
-{
-	if (connection->connection_state < SCCP_CONNECTION_STATE_CONFIRM
-	    || connection->connection_state > SCCP_CONNECTION_STATE_ESTABLISHED) {
-		LOGP(DSCCP, LOGL_ERROR, "sccp_connection_write: Wrong connection state: %p %d\n",
-		       connection, connection->connection_state);
-		return -1;
-	}
-
-	return _sccp_send_connection_data(connection, data);
-}
-
-/*
- * Send a Inactivity Test message. The owner of the connection
- * should start a timer and call this method regularily. Calling
- * this every 60 seconds should be good enough.
- */
-int sccp_connection_send_it(struct sccp_connection *connection)
-{
-	if (connection->connection_state < SCCP_CONNECTION_STATE_CONFIRM
-	    || connection->connection_state > SCCP_CONNECTION_STATE_ESTABLISHED) {
-		LOGP(DSCCP, LOGL_ERROR, "sccp_connection_write: Wrong connection state: %p %d\n",
-		       connection, connection->connection_state);
-		return -1;
-	}
-
-	return _sccp_send_connection_it(connection);
-}
-
-/* send a connection release and wait for the connection released */
-int sccp_connection_close(struct sccp_connection *connection, int cause)
-{
-	if (connection->connection_state < SCCP_CONNECTION_STATE_CONFIRM
-	    || connection->connection_state > SCCP_CONNECTION_STATE_ESTABLISHED) {
-		LOGP(DSCCP, LOGL_ERROR, "Can not close the connection. It was never opened: %p %d\n",
-			connection, connection->connection_state);
-		return -1;
-	}
-
-	return _sccp_send_connection_released(connection, cause);
-}
-
-int sccp_connection_free(struct sccp_connection *connection)
-{
-	if (connection->connection_state > SCCP_CONNECTION_STATE_NONE
-	    && connection->connection_state < SCCP_CONNECTION_STATE_RELEASE_COMPLETE) {
-		LOGP(DSCCP, LOGL_ERROR, "The connection needs to be released before it is freed");
-		return -1;
-	}
-
-	talloc_free(connection);
-	return 0;
-}
-
-int sccp_connection_force_free(struct sccp_connection *con)
-{
-	if (con->connection_state > SCCP_CONNECTION_STATE_NONE &&
-	    con->connection_state < SCCP_CONNECTION_STATE_RELEASE_COMPLETE)
-		llist_del(&con->list);
-
-	con->connection_state = SCCP_CONNECTION_STATE_REFUSED;
-	sccp_connection_free(con);
-        return 0;
-}
-
-struct sccp_connection *sccp_connection_socket(void)
-{
-	return talloc_zero(tall_sccp_ctx, struct sccp_connection);
-}
-
-int sccp_connection_connect(struct sccp_connection *conn,
-			    const struct sockaddr_sccp *local,
-			    struct msgb *data)
-{
-	return _sccp_send_connection_request(conn, local, data);
-}
-
-int sccp_connection_set_incoming(const struct sockaddr_sccp *sock,
-				 int (*accept_cb)(struct sccp_connection *, void *), void *context)
-{
-	struct sccp_data_callback *cb;
-
-	if (!sock)
-		return -2;
-
-	cb = _find_ssn(sock->sccp_ssn);
-	if (!cb)
-		return -1;
-
-	cb->accept_cb = accept_cb;
-	cb->accept_context = context;
-	return 0;
-}
-
-int sccp_write(struct msgb *data, const struct sockaddr_sccp *in,
-	       const struct sockaddr_sccp *out, int class)
-{
-	return _sccp_send_data(class, in, out, data);
-}
-
-int sccp_set_read(const struct sockaddr_sccp *sock,
-		  int (*read_cb)(struct msgb *, unsigned int, void *), void *context)
-{
-	struct sccp_data_callback *cb;
-
-	if (!sock)
-		return -2;
-
-	cb  = _find_ssn(sock->sccp_ssn);
-	if (!cb)
-		return -1;
-
-	cb->read_cb = read_cb;
-	cb->read_context = context;
-	return 0;
-}
-
-static_assert(sizeof(struct sccp_source_reference) <= sizeof(uint32_t), enough_space);
-
-uint32_t sccp_src_ref_to_int(struct sccp_source_reference *ref)
-{
-	uint32_t src_ref = 0;
-	memcpy(&src_ref, ref, sizeof(*ref));
-	return src_ref;
-}
-
-struct sccp_source_reference sccp_src_ref_from_int(uint32_t int_ref)
-{
-	struct sccp_source_reference ref;
-	memcpy(&ref, &int_ref, sizeof(ref));
-	return ref;
-}
-
-int sccp_determine_msg_type(struct msgb *msg)
-{
-	if (msgb_l2len(msg) < 1)
-		return -1;
-
-	return msg->l2h[0];
-}
-
-int sccp_parse_header(struct msgb *msg, struct sccp_parse_result *result)
-{
-	int type;
-
-	if (msgb_l2len(msg) < 1)
-		return -1;
-
-	type = msg->l2h[0];
-	switch(type) {
-	case SCCP_MSG_TYPE_CR:
-		return _sccp_parse_connection_request(msg, result);
-		break;
-	case SCCP_MSG_TYPE_RLSD:
-		return _sccp_parse_connection_released(msg, result);
-		break;
-	case SCCP_MSG_TYPE_CREF:
-		return _sccp_parse_connection_refused(msg, result);
-		break;
-	case SCCP_MSG_TYPE_CC:
-		return _sccp_parse_connection_confirm(msg, result);
-		break;
-	case SCCP_MSG_TYPE_RLC:
-		return _sccp_parse_connection_release_complete(msg, result);
-		break;
-	case SCCP_MSG_TYPE_DT1:
-		return _sccp_parse_connection_dt1(msg, result);
-		break;
-	case SCCP_MSG_TYPE_UDT:
-		return _sccp_parse_udt(msg, result);
-		break;
-	case SCCP_MSG_TYPE_IT:
-		return _sccp_parse_it(msg, result);
-		break;
-	case SCCP_MSG_TYPE_ERR:
-		return _sccp_parse_err(msg, result);
-		break;
-	};
-
-	LOGP(DSCCP, LOGL_ERROR, "Unimplemented MSG Type: 0x%x\n", type);
-	return -1;
-}
-
-static __attribute__((constructor)) void on_dso_load(void)
-{
-	tall_sccp_ctx = talloc_named_const(NULL, 1, "sccp");
-}
-
-static __attribute__((destructor)) void on_dso_unload(void)
-{
-	talloc_report_full(tall_sccp_ctx, stderr);
-}