diff --git a/babeld/source.h b/babeld/source.h
index 38d3c00..62a7e1e 100644
--- a/babeld/source.h
+++ b/babeld/source.h
@@ -48,19 +48,20 @@
     unsigned char plen;
     unsigned short seqno;
     unsigned short metric;
+    unsigned short route_count;
     time_t time;
 };
 
-int source_match(struct source *src,
-                 const unsigned char *p, unsigned char plen);
 struct source *find_source(const unsigned char *id,
                            const unsigned char *p,
                            unsigned char plen,
                            int create, unsigned short seqno);
+struct source *retain_source(struct source *src);
+void release_source(struct source *src);
 int flush_source(struct source *src);
 void update_source(struct source *src,
                    unsigned short seqno, unsigned short metric);
 void expire_sources(void);
-
+void check_sources_released(void);
 
 #endif