linux-cp: Add tests for tun devices

Type: test

Signed-off-by: Neale Ranns <neale@graphiant.com>
Change-Id: Iec69d8624b15766ed65e7d09777819d2242dee17
diff --git a/src/vnet/ipsec/ipsec_itf.h b/src/vnet/ipsec/ipsec_itf.h
index ab317e1..4958d10 100644
--- a/src/vnet/ipsec/ipsec_itf.h
+++ b/src/vnet/ipsec/ipsec_itf.h
@@ -110,6 +110,9 @@
 
 extern ipsec_itf_t *ipsec_itf_get (index_t ii);
 
+typedef walk_rc_t (*ipsec_itf_walk_cb_t) (ipsec_itf_t *itf, void *ctx);
+extern void ipsec_itf_walk (ipsec_itf_walk_cb_t cd, void *ctx);
+
 /*
  * fd.io coding-style-patch-verification: ON
  *