2 files changed, 25 insertions, 0 deletions
diff --git a/lib/if.c b/lib/if.c
index e26aa046..6348403b 100644
--- a/lib/if.c
+++ b/lib/if.c
@@ -304,6 +304,30 @@ if_lookup_address (struct in_addr src)
   return match;
 }
 
+/* Lookup interface by prefix */
+struct interface *
+if_lookup_prefix (struct prefix *prefix)
+{
+  struct listnode *node;
+  struct prefix addr;
+  int bestlen = 0;
+  struct listnode *cnode;
+  struct interface *ifp;
+  struct connected *c;
+
+  for (ALL_LIST_ELEMENTS_RO (iflist, node, ifp))
+    {
+      for (ALL_LIST_ELEMENTS_RO (ifp->connected, cnode, c))
+        {
+          if (prefix_cmp(c->address, prefix) == 0)
+            {
+              return ifp;
+            }
+        }
+    }
+  return NULL;
+}
+
 /* Get interface by name if given name interface doesn't exist create
    one. */
 struct interface *
diff --git a/lib/if.h b/lib/if.h
index 13cc254e..8081be87 100644
--- a/lib/if.h
+++ b/lib/if.h
@@ -245,6 +245,7 @@ extern struct interface *if_create (const char *name, int namelen);
 extern struct interface *if_lookup_by_index (unsigned int);
 extern struct interface *if_lookup_exact_address (struct in_addr);
 extern struct interface *if_lookup_address (struct in_addr);
+extern struct interface *if_lookup_prefix (struct prefix *prefix);
 
 /* These 2 functions are to be used when the ifname argument is terminated
    by a '\0' character: */