if an interface is added to the bridge that doesn't exist, try to create it

triggered by djm's dhclient on vether on bridge setup
ok djm benno claudio

diff --git a/sys/net/if_bridge.c b/sys/net/if_bridge.c
index 839f646..a3d1352 100644 (file)
--- a/sys/net/if_bridge.c
+++ b/sys/net/if_bridge.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_bridge.c,v 1.305 2018/02/08 13:15:31 mpi Exp $     */
+/*     $OpenBSD: if_bridge.c,v 1.306 2018/02/11 02:17:46 henning Exp $ */
 
 /*
  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
@@ -273,10 +273,16 @@ bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
                        break;
 
                ifs = ifunit(req->ifbr_ifsname);
+
+               /* try to create the interface if it does't exist */
+               if (ifs == NULL && if_clone_create(req->ifbr_ifsname, 0) == 0)
+                       ifs = ifunit(req->ifbr_ifsname);
+
                if (ifs == NULL) {                      /* no such interface */
                        error = ENOENT;
                        break;
                }
+
                if (ifs->if_bridgeport != NULL) {
                        p = (struct bridge_iflist *)ifs->if_bridgeport;
                        if (p->bridge_sc == sc)