nat: Keep track of both sides of the connection
On a CC message we will need to remeber where the source local
reference of the network belonged so we can properly identify
the connection when receiving UDT messages.
diff --git a/openbsc/src/nat/bsc_sccp.c b/openbsc/src/nat/bsc_sccp.c
index 226e2e0..e29dc9b 100644
--- a/openbsc/src/nat/bsc_sccp.c
+++ b/openbsc/src/nat/bsc_sccp.c
@@ -103,6 +103,34 @@
return 0;
}
+int update_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed)
+{
+ struct sccp_connections *conn;
+
+ if (!parsed->dest_local_ref || !parsed->src_local_ref) {
+ LOGP(DNAT, LOGL_ERROR, "CC MSG should contain both local and dest address.\n");
+ return -1;
+ }
+
+ llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) {
+ if (conn->bsc != bsc)
+ continue;
+
+ if (memcmp(parsed->dest_local_ref,
+ &conn->patched_ref, sizeof(conn->patched_ref)) != 0)
+ continue;
+
+ conn->remote_ref = *parsed->src_local_ref;
+ LOGP(DNAT, LOGL_DEBUG, "Updating 0x%x to remote 0x%x on 0x%p\n",
+ sccp_src_ref_to_int(&conn->patched_ref),
+ sccp_src_ref_to_int(&conn->remote_ref), bsc);
+ return 0;
+ }
+
+ LOGP(DNAT, LOGL_ERROR, "Referenced connection not found on BSC: 0x%p\n", bsc);
+ return -1;
+}
+
void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed)
{
struct sccp_connections *conn;