Implement AoIP, port to M3UA SIGTRAN (large addition and refactoring)

This was originally a long series of commits converging to the final result
seen in this patch. It does not make much sense to review the smaller steps'
trial and error, we need to review this entire change as a whole.

Implement AoIP in osmo-msc and osmo-bsc.

Change over to the new libosmo-sigtran API with support for proper
SCCP/M3UA/SCTP stacking, as mandated by 3GPP specifications for the IuCS and
IuPS interfaces.

From here on, a separate osmo-stp process is required for SCCP routing between
OsmoBSC / OsmoHNBGW <-> OsmoMSC / OsmoSGSN

jenkins.sh: build from libosmo-sccp and osmo-iuh master branches now for new
M3UA SIGTRAN.

Patch-by: pmaier, nhofmeyr, laforge
Change-Id: I5ae4e05ee7c57cad341ea5e86af37c1f6b0ffa77

1 files changed, 11 insertions, 13 deletions

diff --git a/src/libmsc/iucs.c b/src/libmsc/iucs.c
index aeda1406a..be026c857 100644
--- a/src/libmsc/iucs.c
+++ b/src/libmsc/iucs.c
@@ -40,8 +40,8 @@ static struct gsm_subscriber_connection *subscr_conn_allocate_iu(struct gsm_netw
 {
 	struct gsm_subscriber_connection *conn;
 
-	DEBUGP(DIUCS, "Allocating IuCS subscriber conn: lac %d, link_id %p, conn_id %" PRIx32 "\n",
-	       lac, ue->link, ue->conn_id);
+	DEBUGP(DIUCS, "Allocating IuCS subscriber conn: lac %d, conn_id %" PRIx32 "\n",
+	       lac, ue->conn_id);
 
 	conn = talloc_zero(network, struct gsm_subscriber_connection);
 	if (!conn)
@@ -61,8 +61,7 @@ static int same_ue_conn(struct ue_conn_ctx *a, struct ue_conn_ctx *b)
 {
 	if (a == b)
 		return 1;
-	return (a->link == b->link)
-		&& (a->conn_id == b->conn_id);
+	return (a->conn_id == b->conn_id);
 }
 
 static inline void log_subscribers(struct gsm_network *network)
@@ -78,8 +77,7 @@ static inline void log_subscribers(struct gsm_network *network)
 		case RAN_UTRAN_IU:
 			DEBUGPC(DIUCS, " Iu");
 			if (conn->iu.ue_ctx) {
-				DEBUGPC(DIUCS, " link %p, conn_id %d",
-					conn->iu.ue_ctx->link,
+				DEBUGPC(DIUCS, " conn_id %d",
 					conn->iu.ue_ctx->conn_id
 				       );
 			}
@@ -101,7 +99,7 @@ static inline void log_subscribers(struct gsm_network *network)
 	DEBUGP(DIUCS, "subscribers registered: %d\n", i);
 }
 
-/* Return an existing IuCS subscriber connection record for the given link and
+/* Return an existing IuCS subscriber connection record for the given
  * connection IDs, or return NULL if not found. */
 struct gsm_subscriber_connection *subscr_conn_lookup_iu(
 						struct gsm_network *network,
@@ -109,8 +107,8 @@ struct gsm_subscriber_connection *subscr_conn_lookup_iu(
 {
 	struct gsm_subscriber_connection *conn;
 
-	DEBUGP(DIUCS, "Looking for IuCS subscriber: link_id %p, conn_id %" PRIx32 "\n",
-	       ue->link, ue->conn_id);
+	DEBUGP(DIUCS, "Looking for IuCS subscriber: conn_id %" PRIx32 "\n",
+	       ue->conn_id);
 	log_subscribers(network);
 
 	llist_for_each_entry(conn, &network->subscr_conns, entry) {
@@ -118,12 +116,12 @@ struct gsm_subscriber_connection *subscr_conn_lookup_iu(
 			continue;
 		if (!same_ue_conn(conn->iu.ue_ctx, ue))
 			continue;
-		DEBUGP(DIUCS, "Found IuCS subscriber for link_id %p, conn_id %" PRIx32 "\n",
-		       ue->link, ue->conn_id);
+		DEBUGP(DIUCS, "Found IuCS subscriber for conn_id %" PRIx32 "\n",
+		       ue->conn_id);
 		return conn;
 	}
-	DEBUGP(DIUCS, "No IuCS subscriber found for link_id %p, conn_id %" PRIx32 "\n",
-	       ue->link, ue->conn_id);
+	DEBUGP(DIUCS, "No IuCS subscriber found for conn_id %" PRIx32 "\n",
+	       ue->conn_id);
 	return NULL;
 }