don't allow configuration of non-ipv4 addresses.

i found out how to do this while reading the freebsd stf(4) driver.

diff --git a/sys/net/if_mobileip.c b/sys/net/if_mobileip.c
index 24eb6da..dc74071 100644 (file)
--- a/sys/net/if_mobileip.c
+++ b/sys/net/if_mobileip.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_mobileip.c,v 1.7 2018/02/12 02:55:40 dlg Exp $ */
+/*     $OpenBSD: if_mobileip.c,v 1.8 2018/02/18 23:53:17 dlg Exp $ */
 
 /*
  * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
@@ -355,11 +355,16 @@ mobileip_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 {
        struct mobileip_softc *sc = ifp->if_softc;
        struct ifreq *ifr = (struct ifreq *)data;
+       struct ifaddr *ifa = (struct ifaddr *)data;
        int error = 0;
 
        switch(cmd) {
        case SIOCSIFADDR:
-               /* XXX restrict to AF_INET */
+               if (ifa->ifa_addr->sa_family != AF_INET) {
+                       error = EAFNOSUPPORT;
+                       break;
+               }
+
                ifp->if_flags |= IFF_UP;
                /* FALLTHROUGH */
        case SIOCSIFFLAGS: