Delete any existing v4 address before setting a new one. This allows us

to keep a working default route when the address changes.

ok dlg@ kn@

diff --git a/sys/dev/usb/if_umb.c b/sys/dev/usb/if_umb.c
index 46ecb68..0d0c2c4 100644 (file)
--- a/sys/dev/usb/if_umb.c
+++ b/sys/dev/usb/if_umb.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_umb.c,v 1.55 2023/09/01 20:24:29 mvs Exp $ */
+/*     $OpenBSD: if_umb.c,v 1.56 2023/10/24 09:13:22 jmatthew Exp $ */
 
 /*
  * Copyright (c) 2016 genua mbH
@@ -1814,6 +1814,14 @@ umb_add_inet_config(struct umb_softc *sc, struct in_addr ip, u_int prefixlen,
        struct rtentry *rt;
        int      rv;
 
+       memset(&ifra, 0, sizeof (ifra));
+       rv = in_ioctl(SIOCDIFADDR, (caddr_t)&ifra, ifp, 1);
+       if (rv != 0 && rv != EADDRNOTAVAIL) {
+               printf("%s: unable to delete IPv4 address, error %d\n",
+                   DEVNAM(ifp->if_softc), rv);
+               return rv;
+       }
+
        memset(&ifra, 0, sizeof (ifra));
        sin = &ifra.ifra_addr;
        sin->sin_family = AF_INET;